Attitudes about vaccines to prevent Ebola virus disease in Guinea at the end of a large Ebola epidemic: Results of a national household survey

INTRODUCTION

In 2014-2016, an Ebola epidemic devastated Guinea; more than 3800 cases and 2500 deaths were reported to the World Health Organization. In August 2015, as the epidemic waned and clinical trials of an experimental, Ebola vaccine continued in Guinea and neighboring Sierra Leone, we conducted a national household survey about Ebola-related knowledge, attitudes, and practices (KAP) and opinions about "hypothetical" Ebola vaccines.

METHODS

Using cluster-randomized sampling, we selected participants aged 15+ years old in Guinea's 8 administrative regions, which had varied cumulative case counts. The questionnaire assessed socio-demographic characteristics, experiences during the epidemic, Ebola-related KAP, and Ebola vaccine attitudes. To assess the potential for Ebola vaccine introduction in Guinea, we examined the association between vaccine attitudes and participants' characteristics using categorical and multivariable analyses.

RESULTS

Of 6699 persons invited to participate, 94% responded to at least 1 Ebola vaccine question. Most agreed that vaccines were needed to fight the epidemic (85.8%) and that their family would accept safe, effective Ebola vaccines if they became available in Guinea (84.2%). These measures of interest and acceptability were significantly more common among participants who were male, wealthier, more educated, and lived with young children who had received routine vaccines. Interest and acceptability were also significantly higher among participants who understood Ebola transmission modes, had witnessed Ebola response teams, knew Ebola-affected persons, believed Ebola was not always fatal, and would access Ebola treatment centers. In multivariable analyses of the majority of participants living with young children, interest and acceptability were significantly higher among those living with vaccinated children than among those living with unvaccinated children.

DISCUSSION

The high acceptability of hypothetical vaccines indicates strong potential for introducing Ebola vaccines across Guinea. Strategies to build public confidence in use of Ebola vaccines should highlight any similarities with safe, effective vaccines routinely used in Guinea.

Evaluating the Quality of Sexual Health Care Provided to Adolescents in Medicaid Managed Care: A Comparison of Two Data Sources

This study compares 2 data sources to evaluate the quality of sexual health care provided to adolescents in Medicaid managed care: (a) Medicaid encounter data and (b) medical record data. Data from 1998 for 1112 adolescent enrollees came from 3 Seattle-area managed care organizations (MCOs): a group model health maintenance organization, an independent practice association, and a clinic network. Quality of care was tracked by estimating within-MCO chlamydia testing rates for sexually active female enrollees. Rates varied dramatically depending on which data source was used. Logistic regression models indicated substantially less difference between MCOs when analysis was based on data from the 2 sources combined than when based on either data source alone. Study results did not support the use of Medicaid encounter data as a sole data source for evaluating quality of adolescent sexual health care, despite the cost savings this would represent. However, encounter data, used as an adjunct to medical record review, may increase the reliability of quality evaluations.

Eurogin 2010 roadmap on cervical cancer prevention

The EUROGIN 2010 roadmap represents a continuing effort to provide and interpret updated information on cervical cancer screening and vaccination against the cause of the disease, high-risk human papillomavirus (HPV). Contrary to the two previous reports in 2008 and 2009, the present roadmap gives equal room to HPV-based screening and HPV vaccination, as a result of the recent strengthening of the evidence on the efficacy and feasibility of both approaches. The superiority of HPV testing in primary screening compared to cytology (in more developed countries) and to cytology or visual inspection methods (in less developed countries) has been demonstrated in several randomised trials. High vaccine efficacy has been confirmed up to 7 years after vaccination; school-based programmes in some countries have been able to reach over 70% coverage among adolescent girls. Demonstration projects have indicated that the delivery of HPV vaccines in less developed countries is feasible and favourably received by populations where cervical cancer is very common. HPV-based screening can diminish cervical cancer incidence more quickly than HPV vaccination, but vaccination can eventually facilitate screening efforts, especially if new vaccines against a greater number of HPV types are introduced. The availability of two highly complementary prevention tools such as HPV testing and HPV vaccination makes it possible to conceive integrated strategies for the elimination of cervical cancer that have no precedent in the cancer field. HPV tests and HPV vaccines remain, however, too expensive, and large-scale financing of screening and vaccination in less developed countries is sorely lacking.

Cervical cancer screening and management practices among providers in the National Breast and Cervical Cancer Early Detection Program (NBCCEDP)

BACKGROUND

This study was conducted to describe clinicians serving women in the National Breast and Cervical Cancer Early Detection Program (NBCCEDP) with regard to demographic and practice characteristics and their usual practices in cervical cancer screening and abnormal cytology management, as well as human papillomavirus (HPV) test use.

METHODS

The authors analyzed data from a nationally representative survey conducted in 2004 of providers practicing 7 specialties that commonly offer cervical cancer screening. The program providers were compared with nonprogram providers.

RESULTS

Program providers were found to be significantly more likely than nonprogram providers to be midlevel providers and to serve low-income, racial/ethnic minorities who are insured by Medicaid. In addition, they had significantly more patients with abnormal Papanicolaou tests and were more likely to offer onsite colposcopy (57% vs 40%). Program providers were less likely to use liquid-based cytology (LBC) as their sole method for cytology. Approximately 20% of program and nonprogram providers used HPV DNA testing as an adjunct to screening cytology and two-thirds used HPV tests to manage patients with abnormal cytology results. However, many also used HPV testing for reasons not approved by the U.S. Food and Drug Administration (FDA), such as for screening women age <30 years.

CONCLUSIONS

As of mid-2004, program providers served racially and ethnically diverse, low-income patients who are at high risk for cervical cancer compared with nonprogram providers, as intended by this program. Because many providers offered on-site colposcopy, used LBC, and used HPV tests for patients with abnormal cytology results, they are well equipped to reduce the risk of cervical cancer. Many program providers used the HPV test for reasons that were not approved of by the FDA or reimbursed by the NBCCEDP. The results of this survey have informed training materials for program providers, reimbursement policies for LBC and HPV tests, and interventions to discourage inappropriate HPV testing.

Anogenital Warts Knowledge and Counseling Practices of US Clinicians: Results From a National Survey

OBJECTIVES

To examine messages US clinicians use when counseling patients diagnosed with anogenital warts.

STUDY DESIGN

In mid-2004, we conducted a confidential mail survey of nationally representative samples of physicians practicing internal and adolescent medicine, family/general practice, obstetrics/gynecology, urology, or dermatology; nurse midwives; physician assistants; and nurse practitioners. The survey assessed knowledge and counseling practices of clinicians who had diagnosed anogenital warts.

RESULTS

After adjusting for survey eligibility, 81% responded. Most (89%) were aware that human papillomavirus (HPV) causes anogenital warts, but only 48% were aware that oncogenic and wart-related HPV genotypes usually differ. Most (>95%) clinicians reported telling patients with warts that warts are an STD, are caused by a virus, or that their sex partners may have or may acquire warts. Many clinicians (>/=85%) also reported discussing STD prevention or assessing STD risk with such patients. Most reported addressing ways to prevent HPV (89%), including using condoms; limiting sex partners or practicing monogamy; or abstinence. Many also reported recommending prompt (82%) or more frequent (52%) Pap testing to female patients with anogenital warts. Potential barriers to counseling included providing definitive answers on how HPV infection was acquired, dealing with patients' psychosocial issues, and inadequate reimbursement.

CONCLUSIONS

Most surveyed clinicians appropriately counseled patients about the cause and prevention of anogenital warts. However, many clinicians were unaware that oncogenic and wart-related HPV types usually differ, and this may explain why many reported recommending more aggressive cervical cancer screening for female patients with warts.

Gonorrhea prevention and clinical care in the private sector: lessons learned and priorities for quality improvement

We reviewed literature on gonorrhea prevention and clinical care in the private sector, the setting where most gonorrhea cases in the United States are now diagnosed. Although most private-sector health settings had a low prevalence of gonorrhea (0.1-2.5%), some private emergency departments and specialty clinics that serve a large number of high-risk or infected patients had prevalences ranged from 1.7% to 11.0%. Studies of diverse settings and populations suggest that, in general, diagnostic testing of symptomatic patients (69-83%), appropriate treatment (61-100%), and case reporting (64-94%) are delivered more commonly than risk assessment for asymptomatic patients (15-28%), routine screening of pregnant women (31-77%), risk-reduction counseling (35-78%), and sex partner management (0-82%). To sustain the recent declines in gonorrhea incidence in the United States, private-sector providers and health systems must continue to offer gonorrhea prevention and clinical services and consider implementing interventions to improve delivery of risk assessment, risk-reduction counseling, and partner management services.

A cost-effectiveness evaluation of a jail-based chlamydia screening program for men and its impact on their partners in the community

BACKGROUND

Few cost-effectiveness evaluations of screening men in jails for chlamydia have been published, and none have evaluated the cost-effectiveness of providing partner notification services to the partners of chlamydia-infected inmates.

GOAL

The goal of this study was to evaluate the cost-effectiveness of the chlamydia screening and partner notification programs for men conducted by a Massachusetts jail compared with 3 hypothetical alternatives.

STUDY DESIGN

Using jail cost and testing data, we used decision analyses to compare the cost and effectiveness of universal screening, age-based screening with 2 age cutoffs, and testing of symptomatic inmates at intake using treated cases of chlamydia and gonorrhea as the primary outcome. We also evaluated the cost-effectiveness of adding partner notification to these alternatives.

RESULTS

Universal screening was the most effective and expensive alternative. Age-based screening would have identified slightly fewer cases at half the cost of universal screening. The net cost of partner notification was low. Assuming high sequelae costs in female partners made partner notification a cost-saving intervention.

CONCLUSIONS

Age-based screening could lower costs without substantially sacrificing effectiveness. Notifying partners of infected inmates was a cost-effective adjunct to screening inmates.

Family physicians' knowledge of genital human papillomavirus (HPV) infection and HPV-related conditions, United States, 2004

BACKGROUND AND OBJECTIVES

Information about human papillomavirus (HPV) has evolved rapidly and HPV DNA tests are now available. Little is known about family physicians' knowledge about HPV and how it relates to HPV test use and counseling practices.

METHODS

In mid-2004, confidential surveys were mailed to a nationally representative sample of 760 family physicians. We assessed and analyzed relationships between knowledge about HPV, HPV test use, and counseling messages provided when collecting cervical cytology and managing anogenital warts.

RESULTS

The adjusted response rate was 68% (n=368). Ninety-one percent provided cervical cancer screening, and 90% had managed genital warts. Responses indicated that more than 90% had up-to-date knowledge about several issues: HPV infection is common, persistent infection increases risk of cervical neoplasia, and treatment does not eliminate the causative infection. However, fewer than 50% were aware that HPV infections may clear spontaneously and that the HPV types associated with warts and cervical neoplasia differ. Only 57% had ever used HPV tests. Some HPV knowledge varied by clinician characteristics, and knowledge was associated with HPV test use but not counseling messages.

CONCLUSIONS

Most physicians were aware of new information about HPV infection, but some were unaware of important information relevant for patient counseling. These topics have been highlighted in new clinical training and patient education materials.

Chlamydia screening in a Health Plan before and after a national performance measure introduction

OBJECTIVE

To evaluate chlamydia-screening policies, testing practices, and the proportion testing positive in response to the new Health Plan Employer Data and Information Set (HEDIS) chlamydia-screening performance measure in a large commercial health plan.

METHODS

We interviewed health plan specialty departmental chiefs to describe interventions used to increase chlamydia screening and examined electronic medical records of 15- to 26-year-old female patients--37,438 from 1998 to 1999 and 37,237 from 2000 to 2001--who were classified as sexually active by HEDIS specifications to estimate chlamydia testing and positive tests 2 years before and after the HEDIS measure introduction.

RESULTS

In January 2000, the obstetrics and gynecology department instituted a policy to collect chlamydia tests at the time of routine Pap tests on all females 26 years old or younger by placing chlamydia swabs next to Pap test collection materials. Other primary care departments provided screening recommendations and provider training. During 1998-1999, 57% of eligible female patients seen by obstetrics and gynecology exclusively and 63% who were also seen by primary care were tested for chlamydia; in 2000-2001 the proportions tested increased to 81% (P < .001) and 84% (P < .001). Proportions tested by other primary care specialists did not increase substantially: 30% in 1998-1999 to 32% in 2000-2001. The proportion of females testing positive remained high after testing rates increased: 8% during 1998-1999 and 7% during 2000-2001, and the number of newly diagnosed females increased 10%.

CONCLUSION

After the obstetrics and gynecology department introduced a simple systems-level change in response to the HEDIS measure, the proportion of females chlamydia-tested and number of newly diagnosed females increased.

Estimating prenatal syphilis and HIV screening rates for commercially insured women

OBJECTIVE

Although routine serologic testing for syphilis and human immunodeficiency virus (HIV) for all pregnant women is recommended by the Centers for Disease Control and Prevention and many health professional organizations, little is known about the extent of prenatal syphilis and HIV screening rates among commercially insured pregnant women.

METHODS

A claims database for a large commercially insured population was analyzed to estimate syphilis and HIV screening rates for pregnant women who were continuously enrolled in the same health insurance plan during 1998 and 1999 in 13 U.S. states. Diagnostic and procedural services were used to determine pregnancy status, receipt of prenatal care, and syphilis and HIV testing during pregnancy.

RESULTS

Of 13,250 identified pregnancies, 12,156 (92%) were among women who had prenatal visits; 8368 (63%) included claims for syphilis testing; and 4411 (33%) included claims for HIV testing. Of the 8368 pregnancies with syphilis testing, 6326 (76%) included syphilis tests that were performed during the initial prenatal visit. Of the 4411 pregnancies with HIV testing, 3168 (72%) included HIV testing on the initial prenatal visit. Of 4249 pregnancies with syphilis and HIV testing, 3146 (74%) included HIV testing and syphilis testing on the initial prenatal visit.

CONCLUSIONS

Most HIV and syphilis tests had been provided during initial prenatal visits among women who had HIV and syphilis testing. Prenatal screening rates for syphilis and HIV identified through claims were lower than expected. This may be due to deficiencies in documentation of syphilis and HIV screening in administrative databases or actual screening rates. Further investigation is needed to determine how accurately claims data can measure actual screening practices.

Mental health disorders and sexually transmitted diseases in a privately insured population

OBJECTIVES

To consider whether patients who use mental health services in privately insured settings are also more likely to have received sexually transmitted disease (STD) or human immunodeficiency virus (HIV) diagnoses and whether this relationship extends to patients with milder mental health disorders.

METHODS

Using frequency tables stratified by age and sex, a logistic regression model, and difference of means tests, we examined the relationship between mental health claims and STDs in a sample of 289 604 privately insured people across the United States.

RESULTS

Patients with mental health claims were more than twice as likely as other patients to have an STD claim in the same year after controlling for confounding factors (odds ratio, 2.33; 95% confidence interval, 2.11-2.58). This relationship held for severe and milder mental health diagnoses, for male and female patients, and in each age category from 15 to 44 years. Among women, patients aged 20 to 24 years with a mental health claim had the highest predicted probability of STD diagnoses (3.0%); among men, patients aged 25 to 29 years with a mental health claim had the highest predicted probability of STD diagnoses (1.2%).

CONCLUSIONS

In this population, patients with mental health claims were more likely to also have claims with diagnoses for STDs than patients without mental health claims, and this relationship applied to severe and milder mental health disorders. This suggests that people with mental health disorders in privately insured populations may benefit from routine STD risk assessments to identify high-risk patients for referral to cost-effective preventive services.

Cost-effectiveness of universal screening for chlamydia and gonorrhea in US jails

Universal screening for the sexually transmitted diseases (STDs) of chlamydia and gonorrhea on intake in jails has been proposed as the most effective strategy to decrease morbidity in inmates and to reduce transmission risk in communities after release. Most inmates come from a population that is at elevated risk for STDs and has limited access to health care. However, limited resources and competing priorities force decision makers to consider the cost of screening programs in comparison to other needs. The costs and cost-effectiveness of universal screening in correctional settings have not been documented. We estimated the incremental cost-effectiveness of universal urine-based screening for chlamydia and gonorrhea among inmates on intake in US jails compared to the commonly used practice of presumptive treatment of symptomatic inmates without laboratory testing. Decision analysis models were developed to estimate the cost-effectiveness of screening alternatives and were applied to hypothetical cohorts of male and female inmates. For women, universal screening for chlamydia only was cost-saving to the health care system, averting more health care costs than were incurred in screening and treatment. However, for men universal chlamydia screening cost $4,856 more per case treated than presumptive treatment. Universal screening for both chlamydia and gonorrhea infection cost the health care system $3,690 more per case of pelvic inflammatory disease averted for women and $650 more per case of infection treated for men compared to universal screening for chlamydia only. Jails with a high prevalence of chlamydia and gonorrhea represent an operationally feasible and cost-effective setting to universally test and treat women at high risk for STDs and with limited access to care elsewhere.

Applying a mixed-integer program to model re-screening women who test positive for C. trachomatis infection

We proposed a mixed-integer program to model the management of C. trachomatis infections in women visiting publicly funded family planning clinics. We intended to maximize the number of infected women cured of C. trachomatis infections. The model incorporated screening, re-screening, and treatment options for three age groups with respective age-specific C. trachomatis infection and re-infection rates, two possible test assays, and two possible treatments. Our results showed the total budget had a great impact on the optimal strategy incorporating screening coverage, test selection, and treatment. At any budget level, the strategy that used a relatively small per-patient budget increase to re-screen all women who tested positive 6 months earlier always resulted in curing more infected women and more cost-saving than the strategy that was optimal under the condition of not including a re-screening option.

Risk Behavior for Transmission of Human Immunodeficiency Virus (HIV) among HIV‐Seropositive Individuals in an Urban Setting

We conducted interviews with 256 human immunodeficiency virus (HIV)-infected patients who attended an HIV clinic in New York City to assess ongoing risk behaviors for HIV transmission. After learning that the result of an HIV test was positive, 106 subjects (41%) had unprotected sex, 63 (25%) had a new sexually transmitted disease diagnosis, and 38 (15%) used injection drugs. Unprotected sex was reported by 50% of women, 29% of heterosexual men (P=.006, compared with women), and 42% of men who have sex with men, and it was reported more often by persons with a history of trading sex for money or drugs (P<.001). In multivariate analysis, unprotected sex was associated with a history of trading sex for money or drugs (adjusted odds ratio [AOR], 4.0; 95% confidence interval [CI], 2.2-7.0) and use of highly active antiretroviral therapy (AOR, 1.8; 95% CI, 1.1-3.1). Ongoing risk-reduction counseling and substance abuse treatment for HIV-infected persons are needed to reduce behaviors associated with HIV transmission.

The estimated direct medical cost of sexually transmitted diseases among American youth, 2000

CONTEXT

Each year, millions of U.S. youth acquire sexually transmitted diseases (STDs). Estimates of the economic burden of STDs can help to quantify the impact of STDs on the nation's youth and on the payers of the cost of their medical care.

METHODS

We synthesized the existing literature on STD costs to estimate the lifetime medical cost per case of eight major STDs-HIV, human papillomavirus (HPV), genital herpes simplex virus type 2, hepatitis B, chlamydia, gonorrhea, trichomoniasis and syphilis. We then estimated the total burden of disease by multiplying these cost-per-case estimates by the approximate number of new cases of STDs acquired by youth aged 15-24.

RESULTS

The total estimated burden of the nine million new cases of these STDs that occurred among 15-24-year-olds in 2000 was $6.5 billion (in year 2000 dollars). Viral STDs accounted for 94% of the total burden ($6.2 billion), and nonviral STDs accounted for 6% of the total burden ($0.4 billion). HIV and HPV were by far the most costly STDs in terms of total estimated direct medical costs, accounting for 90% of the total burden ($5.9 billion).

CONCLUSIONS

The large number of infections acquired by persons aged 15-24 and the high cost per case of viral STDs, particularly HIV, create a substantial economic burden.

New sexually transmitted diseases in HIV-infected patients: markers for ongoing HIV transmission behavior

OBJECTIVE

The objective of this study was to describe the rate of new sexually transmitted diseases (STDs) among HIV-infected patients and to define the behavioral and clinical characteristics of HIV-infected patients who return with a new STD in follow-up.

DESIGN

The study design was a record-based clinical cohort study focusing on patients testing HIV-seropositive in the STD clinics of Baltimore, Maryland from 1993 to 1998.

METHODS

The authors identified those HIV-infected patients later diagnosed with an STD in follow-up and compared their demographic, behavioral, and clinical characteristics with those who were not diagnosed with an STD in follow-up.

RESULTS

Of 796 men and 354 women with HIV infection, 13.9% of men and 11.9% of women were diagnosed with an STD after their initial HIV diagnosis. HIV-infected men returned with a new STD at a rate of 7 cases per 100 person-years; HIV-infected women returned at a rate of 5.6 cases per 100 person-years. In men, multiple sex partners and sex worker contact were associated with a subsequent STD diagnosis (OR = 1.67, p =.037; OR = 1.82, p =.015, respectively). In women, age younger than 30 years was associated with the diagnosis of an STD after the diagnosis of HIV infection (OR = 2.94, p =.0009).

CONCLUSIONS

Patients diagnosed with HIV in an STD clinic setting commonly return with new STDs in follow-up, suggesting continued exposure of HIV to others. More intensive screening and counseling interventions focused on STD prevention in those with HIV infection is a necessary HIV prevention strategy.

Do physicians provide counseling with HIV and STD testing at physician offices or hospital outpatient departments?

OBJECTIVES

To estimate the frequency of HIV/sexually transmitted disease (STD) counseling among patients tested for HIV or STD infection at physician offices and hospital outpatient departments and to describe the factors associated with HIV/STD counseling in private settings in the USA.

DESIGN

Cross-sectional study of patients served by physicians in private settings in the USA.

METHODS

We analyzed 1997-1998 data from two representative national surveys of ambulatory care visits in private settings by persons aged 18-64 years.

RESULTS

During 1997-1998, 12.7 million ambulatory care visits included HIV or STD testing. HIV/STD counseling was documented in 35% of all visits and in 28% of visits by pregnant women at the time HIV or STD tests were done. Counseling was less common when only HIV tests (21%) or STD tests (37%) alone were carried out than when both HIV and STD tests (50%) were performed. Counseling was more common (65%) if the patient's reason for visit was related to HIV, STD, or genitourinary complaints than if the visit was for other reasons.

CONCLUSIONS

Private physicians often counseled about HIV/STD when testing patients with symptoms. The proportion of other visits in which counseling accompanied HIV or STD tests was variable. This suggests the need for a better understanding of the reasons why clinicians in private settings decide whether to counsel patients about HIV and STD when they order testing, barriers to offering counseling, and interventions to increase counseling when appropriate.

Provision of sexual health services to adolescent enrollees in Medicaid managed care

OBJECTIVES

This Seattle project measured sexual health services provided to 1112 Medicaid managed care enrollees aged 14 to 18 years.

METHODS

Three health maintenance organizations (HMOs) that provide Medicaid services for a capitated rate agreed to participate. These included a non-profit staff-model HMO, a for-profit independent practice association (IPA), and a non-profit alliance of community clinics. Analyses used health maintenance organizations' administrative data, chart reviews, and Medicaid encounter data.

RESULTS

Health maintenance organizations provided primary care to 54% and well care to 20% of Medicaid enrollees. Girls were more likely than boys to have their sexual history taken or to be given condom counseling. Only 27% of sexually active girls were tested for chlamydia, with significantly lower rates of testing among those who spoke English as a second language. The nonprofit staff-model plan outperformed the for-profit independent practice association on most measures.

CONCLUSIONS

Substantial room for improvement exists in sexual health services delivery to adolescent Medicaid managed care enrollees.

Optimal resource allocation for curing Chlamydia trachomatis infection among asymptomatic women at clinics operating on a fixed budget

GOAL

The goal was to determine the optimal strategy for screening coverage, test selection, and treatment for infection in asymptomatic women for a given family-planning-program budget.

STUDY DESIGN

We developed a resource allocation model to determine the optimal strategy using data from 5078 visits by women universally screened for infection in a publicly funded family planning clinic system in Philadelphia. We maximized the number of infected women cured from the clinic perspective and maximized the cost-savings from the healthcare system perspective. The model incorporated the following age distributions: <20 years (27%), 20 to 24 years (30%), and >24 years (43%), with prevalences of 10.6%, 6.9%, and 2.3%, respectively. We modeled two screening test assays (DNA probe and ligase chain reaction [LCR] for cervical specimens) and two treatments (doxycycline and azithromycin). The model allowed for different test and treatment choices by age group.

RESULTS

At the baseline annual budget of $6 per visit, the strategy that maximized both the number of infected women cured and cost savings would be to screen all women with DNA probe and to treat all women with positive tests with azithromycin. This strategy would result in 183 women cured at a cost-savings of $140,176. Sensitivity analysis showed that the total budget had a great impact on the optimal strategy, incorporating screening coverage, test selection, and treatment.

CONCLUSIONS

Using resource allocation models enables clinic managers operating with a fixed budget to identify a strategy that maximizes the number of asymptomatic women cured and cost savings when the clinic age distribution and age-specific prevalences are known.

Screening tests to detect Chlamydia trachomatis and Neisseria gonorrhoeae infections--2002

Since publication of CDC's 1993 guidelines (CDC, Recommendations for the prevention and management of Chlamydia trachomatis infections, 1993. MMWR 1993;42[No. RR-12]:1-39), nucleic acid amplification tests (NAATs) have been introduced as critical new tools to diagnose and treat C. trachomatis and Neisseria gonorrhoeae infections. NAATs for C. trachomatis are substantially more sensitive than previous tests. When using a NAAT, any sacrifice in performance when urine is substituted for a traditional swab specimen is limited, thus reducing dependence on invasive procedures and expanding the venues where specimens can be obtained. NAATs can also detect both C. trachomatis and N. gonorrhoeae organisms in the same specimen. However, NAATs are usually more expensive than previous tests, making test performance from an economic perspective a key consideration. This report updates the 1993 guidelines for selecting laboratory tests for C. trachomatis with an emphasis on screening men and women in the United States. (In this report, screening refers to testing persons in the absence of symptoms or signs indicating C. trachomatis or N. gonorrhoeae infection.) In addition, these guidelines consider tests from an economic perspective and expand the previous guidelines to address detection of N. gonorrhoeae as well as C. trachomatis infections. Because of the increased cost of NAATs, certain laboratories are modifying manufacturers' procedures to improve test sensitivity without incurring the full cost associated with screening with a NAAT. Such approaches addressed in these guidelines are pooling of specimens before testing with a NAAT and additional testing of specimens whose non-NAAT test result is within a gray zone. This report also addresses the need for additional testing after a positive screening test to improve the specificity of a final diagnosis. To prepare these guidelines, CDC staff identified pertinent concerns, compiled the related literature published during 1990 or later, prepared tables of evidence, and drafted recommendations. Consultants, selected for their expertise or disciplinary and organizational affiliations, reviewed the draft recommendations. These final guidelines are the recommendations of CDC staff who considered contributions from scientific consultants. These guidelines are intended for laboratorians, clinicians, and managers who must choose among the multiple available tests, establish standard operating procedures for collecting and processing specimens, interpret test results for laboratory reporting, and counsel and treat patients.

A cost-effectiveness evaluation of testing and treatment of Chlamydia trachomatis infection among asymptomatic women infected with Neisseria gonorrhoeae

BACKGROUND

Because patients infected with Neisseria gonorrhoeae are frequently coinfected with Chlamydia trachomatis, routine dual treatment of patients with N gonorrhoeae infection is frequently practiced and has long been recommended.

GOAL

The goal of this study was to examine the cost-effectiveness of routine dual treatment of women with infection, with or without separate testing for C trachomatis, compared with an alternative of testing for both infections and restricting treatment for C trachomatis to women testing positive for C trachomatis.

STUDY DESIGN

A decision analysis compared the cost-effectiveness of these options using cases of pelvic inflammatory disease prevented as the outcome. Parameter values were taken from the literature.

RESULTS

Routine dual treatment is not an effective or cost-effective replacement for testing for C trachomatis, but it can increase the number of cases of C trachomatis treated when combined with testing. Dual treatment results in more overtreatment of infection C trachomatis than treatment based on test results.

CONCLUSIONS

Testing for both infections is more cost-effective than routine presumptive treatment for C trachomatis. Providing both presumptive treatment and testing for C trachomatis can also be cost-effective in some settings.

Understanding sexual activity defined in the HEDIS measure of screening young women for Chlamydia trachomatis

BACKGROUND

Periodic screening of sexually active young women for Chlamydia trachomatis is widely recommended and is now monitored in the Health Plan Employer Data and Information Set (HEDIS). Because little is known about how well the HEDIS measure identifies sexually active women eligible for screening, rates of sexual activity as defined by the measure's specifications were compared with those derived from self-reported sexual behavior and use of sexual health services among privately insured women.

METHODS

Using the 1996 MarketScan claims data for privately insured women aged 15-25 years, a measure of sexual activity based on the HEDIS specifications for sexual activity was calculated, that is, claims for Pap tests and pelvic examinations, contraceptive services, pregnancy-related service, and screening and treatment for sexually transmitted diseases.

RESULTS

For privately insured women 15-25 years of age, the sexual activity rate was estimated to be 27% based on the HEDIS algorithm using the MarketScan claims data and 60% based on self-reported sexual behavior or 62% based on self-reported use of sexual health services using the 1995 National Survey of Family Growth (NSFG) data.

DISCUSSION

Among young, privately insured women, use of claims specified by HEDIS classifies a smaller proportion of young women as sexually active than does use of self-reported survey data on sexual behavior or use of sexual health services. If HEDIS continues to rely on claims data because it is easier or less costly to collect and analyze than survey data, users of this performance measure should be aware that it may underestimate the number of women who are eligible for this screening benefit.

Chlamydia trachomatis infection in women: bad news, good news, and next steps in prevention

Chlamydia trachomatis causes largely asymptomatic infections that can lead to pelvic inflammatory disease, infertility, ectopic pregnancy, and chronic pelvic pain. Screening women routinely is critical to controlling the epidemic of this disease. Testing innovations now make diagnosis easier, and simple treatment regimens may improve compliance with medications and increase cure rates, but testing and treatment must be coupled with improved screening efforts and effective partner services. Ongoing research may point to other interventions that will increase our success in fighting chlamydial infections.

Federally funded sexually transmitted disease programs and managed care: a review of current and planned partnerships

BACKGROUND

The Centers for Disease Control and Prevention requested that sexually transmitted disease (STD) programs report their current activities and plans to collaborate with managed care organizations in their 1999 applications for federal funding.

GOAL

To review CDC STD program applications for funding to assess the number of activities between STD programs and managed care organizations.

METHODS

Narrative data on managed care topics were abstracted from 59 funding applications (50 states, 7 cites or counties, and 2 US territories), using standard qualitative methods. A coding system was applied to categorize each managed care activity into one of nine categories (interrater reliability, 93%). An expert panel ranked activities by complexity, and these scores were used to develop an overall complexity score for each program.

RESULTS

All but 9 of the 59 applicants reported managed care organization activities. Altogether, 208 activities were specifically documented, 45% of which were classified as operational in 1999. The most frequently reported activities involved gathering and giving information and promoting STD care through legislation and state Medicaid activities.

CONCLUSIONS

Considerable information transfer and policy action between STD programs and managed care organizations are taking place. Further integration of services and policies should be studied and encouraged to promote the effective treatment of STD.

Utilization of preventive medical services in the United States: a comparison between rural and urban populations

Differences between rural and urban residents in their utilization of three clinical preventive services--Papanicolaou screening tests (Pap smears) for women aged 18 to 65, mammograms for women aged 50 to 69 and flu shots for people aged 65 or older--were examined using a nationally representative sample from the 1994 U.S. National Health Interview Survey. Eighty-two percent of urban women and 79 percent of rural women (P = 0.11) had Pap smears. Sixty-eight percent of urban women and 61 percent of rural women (P = 0.01) had mammograms. Flu shots were received by 55 percent of urban and 58 percent of rural elderly residents (P = 0.11). Of women aged 50 to 69 who had a high school education or whose annual household income was between $15,000 and $34,999, significantly fewer rural than urban women had mammograms (P < 0.01). However, the proportion of rural women receiving mammograms was not significantly different from that of urban women after adjusting for their education, household income and health insurance status. Education level, house-hold income and health insurance coverage were positively associated with utilizing mammograms. These results suggest that differences in the utilization of preventive services between rural and urban women vary by services. Improving socioeconomic status and health insurance coverage of rural women may reduce the disparity in mammogram use between rural and urban women. Mechanisms of how a woman's socioeconomic status affects her utilization of mammograms needs further study.

Sex trading and psychological distress in a street-based sample of low-income urban men

This article examines the relationship between sex trading and psychological distress and assesses sexual human immunodeficiency virus (HIV) risk behaviors and HIV seroprevalence in a sample of young men recruited from the streets of Harlem. The authors interviewed 477 men, aged 18 to 29 years, of whom 43 (9.0%) had received money or drugs in exchange for sex in the preceding 30 days and were categorized as sex traders. Psychological distress was measured by using the Brief Symptom Inventory (BSI). Sex traders scored significantly higher than non-sex traders on the General Severity Index and on all nine subscales of the BSI. According to multivariate analysis after adjusting for perceived HIV risk, current regular crack cocaine use and homelessness, sex traders scored 0.173 units higher on the General Severity Index than non-sex traders (p < .001). More of the sex traders tested positive for HIV (41% versus 19%, p < .001). The alarmingly high HIV seroprevalence rate in sex traders in this sample underscores the need to redouble HIV prevention efforts for this population. The high levels of psychological distress and crack cocaine dependence among sex traders may undermine their ability to adopt safer sex behaviors and should be considered in intervention designs.

Influence of human immunodeficiency virus infection on pelvic inflammatory disease

OBJECTIVE

To examine the influence of human immunodeficiency virus (HIV) infection on clinical and microbiologic characteristics of pelvic inflammatory disease (PID).

METHODS

Forty-four HIV-infected women and 163 HIV noninfected women diagnosed with PID by standard case definition were evaluated by using clinical severity scores, transabdominal sonograms, and endometrial biopsies. After testing for bacterial infections, patients were prescribed antibiotics as recommended by the Centers for Disease Control and Prevention (CDC).

RESULTS

Symptoms of PID and analgesic use before enrollment did not differ by HIV serostatus. More HIV-infected women had received antibiotics before enrollment (40.9% versus 27.2%, P =.08), a factor associated with milder signs regardless of serostatus. More HIV-infected women had sonographically diagnosed adnexal masses at enrollment (45.8% versus 27.1%, P =.08), a difference that yielded higher median severity scores (17.5 of 42 points versus 15 of 42 points, P =.07). However, those differences were not significant at the P <.05 level. Mycoplasma (50% versus 22%, P <.05) and streptococcus species (34% versus 17%, P <.05) were isolated more commonly from biopsies of HIV-infected women. Within 30 days after enrollment, HIV-infected women generally responded as well to therapy as HIV-noninfected women did, regardless of initial CD4 T-lymphocyte percentage.

CONCLUSION

Among women with acute PID, HIV infection was associated with more sonographically diagnosed adnexal masses. Clinical response to CDC-recommended antibiotics did not differ appreciably by serostatus. Mycoplasmas and streptococci were isolated more commonly from HIV-infected women, but those organisms also might be associated with PID in immunocompetent women.

Direct medical cost of pelvic inflammatory disease and its sequelae: decreasing, but still substantial

OBJECTIVE

To estimate direct medical costs and average lifetime cost per case of pelvic inflammatory disease (PID).

METHODS

We estimated the direct medical expenditures for PID and its three major sequelae (chronic pelvic pain, ectopic pregnancy, and infertility) and determined the average lifetime cost of a case of PID and its sequelae. We analyzed 3 years of claims data of privately insured individuals to determine costs, and 3 years of national survey data to determine number of cases of PID, chronic pelvic pain, and ectopic pregnancy. We developed a probability model to determine the average lifetime cost of a case of PID.

RESULTS

Direct medical expenditures for PID and its sequelae were estimated at $1.88 billion in 1998: $1.06 billion for PID, $166 million for chronic pelvic pain, $295 million for ectopic pregnancy, and $360 million for infertility associated with PID. The expected lifetime cost of a case of PID was $1167 in 1998 dollars. The majority of those costs ($843 per case) represent care for acute PID rather than diagnosis and treatment of sequelae. Approximately 73% of cases will not accrue costs beyond the treatment of acute PID.

CONCLUSION

The direct medical cost of PID is still substantial. The majority of PID related costs are incurred in the treatment of acute PID. Because most PID-related costs arise in the first year from treatment of acute PID infection, strategies that prevent PID are likely to be cost-effective within a single year.

Missed opportunities to assess sexually transmitted diseases in U.S. adults during routine medical checkups

OBJECTIVES

Although sexually transmitted diseases (STDs) cause tremendous health and economic burdens in our society, awareness and knowledge regarding STDs remain poor among health care providers. To examine missed opportunities for STD-related counseling, diagnosis and treatment, we investigated how frequently U.S. adults reported being asked about STDs by their health care providers during routine checkups.

METHODS

We analyzed the responses of 3390 adults aged 18-64 who reported having a routine checkup during the past year in the 1994 U.S. National Health Interview Survey (NHIS), a nationally representative survey. We used a logistic model to determine factors that were independently associated with the likelihood of being asked about STDs during the checkup.

RESULTS

Only 28% (+/-0.9%) of respondents reported being asked about STDs during their last routine checkup. Persons were significantly more likely (p<0.05) to be asked about STDs if they were aged under 45, male, single, had a household income under the federal poverty level, or were insured by a health maintenance organization, public coverage or by no plan rather than by a fee-for-service arrangement.

CONCLUSIONS

Only about one quarter of U.S. adults reported being asked about STDs during routine checkups. Routine checkups in which these issues are not discussed may represent missed opportunities for STD prevention. Persons presenting for routine care can be counseled, screened and, if infected, can be treated. Interventions are needed at the patient, provider, and community levels to increase the opportunities to assess STD risk, to counsel, to diagnose, and to treat infections during routine checkups.

Presence of human immunodeficiency virus (HIV) type 1, group M, non-B subtypes, Bronx, New York: a sentinel site for monitoring HIV genetic diversity in the United States

In the United States, human immunodeficiency virus (HIV) type 1, group M, subtype B is the predominant subtype. A cross-sectional study of HIV-infected patients at the Bronx-Lebanon Hospital Center, Bronx, NY, between September 1997 and February 1998 identified 3 (1. 2%) of 252 persons infected with non-B subtypes: subtypes A and F, 1 each, and 1 potential recombinant subtype B(env)/F(prt). All 3 persons were born in the United States and tested positive for HIV antibodies between 1988 and 1997 while living in the Bronx. None reported travel to other countries, receipt of blood products, or drug injection. This study is among the first to indicate probable transmission of non-B HIV-1 subtypes in the United States. The occurrence of non-B HIV-1 subtypes in long-term US residents without a history of foreign travel may have implications for the evaluation and development of antiretroviral drugs, vaccines, and tests intended for use in the United States to diagnose HIV infection and screen blood.

Adherence to antiretroviral medications in an inner-city population

Adherence to antiretroviral medications is essential for optimal treatment of HIV infection. We investigated nonadherence to antiretroviral medications in an inner-city population by using a confidential interview and a self-administered anonymous questionnaire. We estimated adherence on the day before and the month before the interview and asked reasons for nonadherence. Of 173 people who were taking antiretroviral medications, all participated in the confidential interview and 101 also completed the anonymous questionnaire. Results of the confidential interview and the anonymous questionnaire revealed rates of 6% and 28%, respectively, for nonadherence to any drug on the preceding day and of 11% and 39%, respectively, in the preceding month. The most common reasons for nonadherence in both methods were forgetfulness, inaccessibility of medications, and perceived or actual toxicity. On 12% of the anonymous questionnaires one reason for nonadherence was perceived or actual lack of drug efficacy: this reason was not given in any of the confidential interviews. Responses about the extent of nonadherence and the reasons for it may differ depending on the method of ascertainment. Interventions to improve adherence should focus on making medication dosages easier to remember, ensuring a continued supply of medications, and circumventing toxicities.

STD testing policies and practices in U.S. city and county jails

BACKGROUND AND OBJECTIVES

Studies have shown that sexually transmitted disease (STD) rates are high in the incarcerated population. However, little is known about STD testing policies or practices in jails.

GOAL

To assess STD testing policies and practices in jails.

STUDY DESIGN

The Division of STD Prevention developed and distributed an e-mail survey to 94 counties reporting more than 40 primary and secondary cases in 1996 or having cities with more than 200,000 persons. State and local STD program managers completed the assessment in collaboration with health departments and the main jail facilities in the selected counties.

RESULTS

Most facilities (52-77%) had a policy for STD screening based only on symptoms or by arrestee request, and in these facilities, 0.2% to 6% of arrestees were tested. Facilities having a policy of offering routine testing tested only 3% to 45% of arrestees. Large facilities, facilities using public providers, and facilities routinely testing for syphilis using Stat RPR tested significantly more arrestees (P<0.05). Approximately half of the arrestees were released within 48 hours after intake, whereas 45% of facilities did not have STD testing results until after 48 hours.

CONCLUSION

Most facilities had a policy for STD screening based only on symptoms or by arrestee request. Facilities having a policy of routine STD testing are not testing most of the arrestees. There is a small window (<48 hours) for STD testing and treatment before release. Smaller jails and facilities using private providers may need additional resources to increase STD testing levels. Correctional facilities should be considered an important setting for STD public health intervention where routine rapid STD screening and treatment on-site could be implemented.

New HIV cases attributable to syphilis in the USA: estimates from a simplified transmission model

OBJECTIVE

Because syphilis can raise the likelihood of HIV transmission and acquisition, syphilis prevention in the USA has the potential benefit of reducing the number of new cases of HIV. We developed a simplified transmission model to estimate the annual number and cost of new, heterosexually-acquired HIV cases in the USA attributable to syphilis.

DESIGN

We estimated the number of heterosexual, HIV serodiscordant partnerships in which syphilis was present in 1996. The model included the probability of transmission of HIV (with and without the presence of syphilis) and other parameters based on data from recent literature. Published direct costs (HIV treatment costs including antiretroviral therapy) and indirect costs (e.g., lost productivity) per case of HIV were used to estimate the annual cost of HIV cases attributable to syphilis. The potential savings in averted HIV costs related to syphilis were used to estimate the potential benefits of a syphilis elimination program.

RESULTS

In 1996, an estimated 1082 new heterosexual cases of HIV in the USA could be attributed to syphilis. These cases represented direct costs of US$ 211 million and indirect costs of US$ 541 million; yielding US$ 752 million in total costs. Over 15 years, a syphilis elimination program could save over US$ 833 million (discounted at 3% annually) in averted direct medical costs of syphilis-related HIV infections.

CONCLUSIONS

If the only benefit of syphilis elimination were to prevent new HIV cases attributable to syphilis, a national syphilis elimination program costing less than US$ 833 million would probably pay for itself.

The high-risk sexual practices of crack-smoking sex workers recruited from the streets of three American cities. The Multicenter Crack Cocaine and HIV Infection Study Team

BACKGROUND AND OBJECTIVES

Small ethnographic and clinic-based studies indicate that crack-smoking sex workers are at high risk for human immunodeficiency virus (HIV) and sexually transmitted diseases (STD).

STUDY GOALS

To examine the prevalence of risky sexual behaviors and HIV and STD in a large sample of street-recruited crack-smoking sex workers.

STUDY DESIGN

From 1991 to 1992, 419 crack-smoking sex workers were recruited from urban neighborhoods, interviewed, and serologically tested.

RESULTS

Many female and male sex workers reported sex with injectors (30% to 41%) or HIV-infected persons (8% to 19%), past STD (73% to 93%), and inconsistent condom use (> 50% for all types of sex). Sex workers who worked in crack houses or vacant lots, were paid with crack, or injected drugs had the riskiest sex practices. Most sex workers initiated sex work before they first smoked crack. More than 25% were infected with HIV (27.9%), syphilis (37.5%), or herpes simplex virus type 2 (66.8%).

CONCLUSIONS

Interventions to prevent HIV/STD transmission among crack-smoking sex workers are urgently needed.

Presence of human immunodeficiency virus (HIV) type 1 subtype A infection in a New York community with high HIV prevalence: a sentinel site for monitoring HIV genetic diversity in North America. Centers for Disease Control and Prevention-Bronx Lebanon HIV Serosurvey Team

To determine whether US residents are infected with subtypes of human immunodeficiency virus (HIV) type 1 other than subtype B (Western), the predominant North American subtype with a unique GPGR genetic sequence in the V3 loop, viruses from 22 HIV-infected adults were serotyped and subtyped. Twenty patients had subtype B (Western), of whom 15 had serotype B (Western), 3 had serotype A/C, 1 had serotype B (Thai), and 1 had a nontypeable serotype. Two had subtype A, both serotype A/C. Both subtype A-infected patients, only 1 of whom had been outside the United States, reported sex with persons traveling abroad, suggesting possible acquisition in the United States. Because US residents are infected with non-subtype B (Western) strains, US surveillance for HIV-1 diversity is needed to elucidate subtype-specific transmission patterns and pathogenesis and to guide evaluation and development of HIV diagnostic tests and vaccines.

Sex trading and psychological distress among women recruited from the streets of Harlem

OBJECTIVES

This study examines the relationship between sex trading and psychological distress and the implications of that relationship for prevention of human immunodeficiency virus among a sample of young women recruited from the streets of Harlem.

METHODS

Interviews were conducted with 346 predominantly drug-using women, aged 18 to 29 years, of whom 176 had exchanged sex for money or drugs in the previous 30 days and were categorized as "sex traders." Psychological distress was measured by using the Brief Symptom Inventory.

RESULTS

Sex traders scored significantly higher than non-sex traders on the General Severity Index and on eight of the nine subscales of the Brief Symptom Inventory. Multivariate analysis indicated that after adjustments were made for age; ethnicity; pregnancy; recent rape; perceived risk for acquired immunodeficiency syndrome; current, regular crack use; and current, regular alcohol use, sex traders scored 0.240 units higher on the General Severity Index than non-sex traders.

CONCLUSIONS

Poor mental health and drug dependence may under-mine the motivation and ability of these sex traders to adopt safer sex behavior. Therefore, interventions need to be integrated with mental health services and drug treatment to reduce risk behavior in this population.

The acceptability of voluntary HIV antibody testing in the United States: a decade of lessons learned

OBJECTIVE

As the benefits of early diagnosis of HIV increase, US adults are more likely to be offered HIV counseling and testing in settings where they may not seek testing. Rates and determinants of counseling and testing acceptance in these settings are poorly understood.

DESIGN

We reviewed articles and abstracts published from 1985 to 1995 which addressed rates or determinants of counseling and testing acceptance in facilities that provide perinatal, family planning, gynecology, sexually transmitted disease (STD) and drug treatment services, hospitals, and prisons. Data reflected testing experience of more than 240,000 adults.

RESULTS

Acceptance rates varied widely (3-100%), even within settings of the same type. Acceptance was generally higher (> 50%) among persons at high risk for acquiring or transmitting the infection (e.g., STD patients, pregnant women at high risk) than among low-risk persons. Factors associated with high acceptance rates included the client's perception of HIV risk, acknowledging risk behaviors; confidentiality protections; presenting counseling and testing as 'routine' rather than optional; and the provider's belief that counseling and testing will benefit the client. Factors associated with low acceptance rates included prior HIV testing, fears about coping with results, and explicit informed consent.

CONCLUSIONS

To institute and evaluate counseling and testing programs for persons who do not specifically seek testing, multiple determinants of acceptance must be considered. Practices that protect confidentiality, endorse counseling directed to a client's unique circumstances, and highlight the medical and social benefits of testing are likely to promote acceptance. Acceptance of counseling and testing offered nonroutinely to the numerous Americans who have been previously tested or are at low risk is likely to be low.

Crack cocaine smokers who turn to drug injection: characteristics, factors associated with injection, and implications for HIV transmission. The Multicenter Crack Cocaine and HIV Infection Study Team

A survey of 1220 street-recruited crack cocaine smokers revealed that crack smokers may turn to drug injection to ease crack withdrawal. Crack smokers who later injected tended to smoke crack more heavily and for longer periods than those who did not inject. The initiation of injection was significantly associated with ever snorting heroin (prevalence ratio [PR] = 3.4, 95% confidence interval [CI] = 2.0-5.9) or snorting heroin specifically while smoking crack (PR = 2.3, 95% CI = 1.3-4.0), suggesting that snorted heroin use may mediate the transition to injection among crack smokers. Programs to prevent and treat crack dependence may prevent later injection and injection-related infections including HIV.

Absence of human immunodeficiency virus type 2 infection among patients in a hospital serving a New York community at high risk for infection. Centers for Disease Control and Prevention/Bronx-Lebanon Hospital Center HIV Serosurvey Team

BACKGROUND

Although human immunodeficiency virus type 2 (HIV-2) infection among United States residents is considered rare, there are US populations at high risk. Few studies have surveyed these populations with a high likelihood of infection, that is, those with high percentages of persons from HIV-2-endemic areas and high prevalences of behaviors that would allow for transmission.

STUDY DESIGN AND METHODS

Patients (n = 832) enrolled in a confidential HIV serosurvey at a hospital that serves a community with a relatively high percentage of West African immigrants, drug injectors, and persons who practice high-risk sexual activity were evaluated. Sera were tested for HIV type 1 (HIV-1) and HIV-2 by rapid enzyme immunoassays, standard enzyme immunoassays and Western blots.

RESULTS

Eight of 832 patients were weakly reactive to HIV-2 on rapid assay, but none was confirmed to be infected when tested by standard immunoassay and Western blot. Five of these eight were reactive to HIV-1.

CONCLUSION

Weak reactivity to HIV-2 antibody on the rapid assay is best explained by cross-reactivity with HIV-1 antibody; thus, even in this population at high risk for infection, false-positive reactions are more likely than true infections. The finding that HIV-2 is absent in this population at potentially high risk for infection corroborates the findings of other studies that HIV-2 infection is rare among US residents. These results support previous recommendations that, in settings other than blood collection facilities, HIV-2 testing should be selectively offered to persons with epidemiologic risk factors.

Urban rape survivors: characteristics and prevalence of human immunodeficiency virus and other sexually transmitted infections. Multicenter Crack Cocaine and HIV Infection Study Team

OBJECTIVE

To determine the prevalence of recent rape, the characteristics or recent rape survivors, and the seroprevalence of human immunodeficiency virus (HIV), syphilis, and genital herpes (HSV-2) among recent rape survivors.

METHODS

We surveyed women 18-29 years old who were recruited from places unassociated with medical or drug treatment or the criminal justice system in three urban communities where illicit drug use is common. We compared characteristics and HIV, syphilis, and HSV-2 seroprevalence of women who reported recent rape with those of women who denied recent rape.

RESULTS

One hundred fifty-one of 1104 (13.7%) women reported having been raped in the year before our interview. Rape survivors were more likely than women who denied recent rape to smoke crack cocaine (86.8 versus 56.7%; odds ratio [OR] 5.0, 95% confidence interval [CI] 3.2-7.8), to be homeless (17.2 versus 6.1%; OR 3.2, CI 2.0-5.2), to report a recent sexually transmitted disease (38.7 versus 18.7%; OR 2.7, CI 1.9-3.9), and to be infected with syphilis (42.4 versus 28.4%; OR 1.9, CI 1.3-2.6) and HSV-2 (71.9 versus 57.5%; OR 1.9, CI 1.3-2.8). Survivors were more likely to acknowledge any HIV risk behavior (including sex work) (85.4 versus 49.5%; OR 5.9, CI 3.9-9.0) and to be HIV-infected (23.3 versus 13.4%; OR 1.9, CI 1.3-2.9). Rape was not independently associated with HIV (OR 0.8, 95% CI 0.4-1.3), syphilis (OR 0.9, 95% CI 0.6-1.3), or HSV-2 (OR 1.3, 95% CI 0.9-2.0) infections after adjustment for confounding factors.

CONCLUSION

One in seven women reported being raped recently. Rape was most common among sex workers, crack smokers, and the homeless. Most survivors reported HIV risk behaviors, and many were HIV-infected. Programs to prevent repeated rape, voluntary HIV counseling and testing, and other medical and social services may benefit survivors in these and similar communities.

Intersecting epidemics--crack cocaine use and HIV infection among inner-city young adults. Multicenter Crack Cocaine and HIV Infection Study Team

BACKGROUND AND METHODS

The smoking of "crack" cocaine is thought to be associated with high-risk sexual practices that accelerate the spread of infection with the human immunodeficiency virus (HIV). We studied 2323 young adults, 18 to 29 years of age, who smoked crack regularly or who had never smoked crack. The study participants, recruited from the streets of inner-city neighborhoods in New York, Miami, and San Francisco, were interviewed and tested for HIV. This report presents the findings for the 1967 participants (85 percent) who had never injected drugs.

RESULTS

Of the 1137 crack smokers, 15.7 percent were positive for HIV antibody, as compared with 5.2 percent of the 830 nonsmokers (prevalence ratio adjusted for the city, 2.4; 99 percent confidence interval, 1.7 to 3.6). The prevalence of HIV was highest among the crack-smoking women in New York (29.6 percent) and Miami (23.0 percent). Of the 283 women who had sex in exchange for money or drugs, 30.4 percent were infected with HIV as compared with 9.1 percent of the 286 other women (prevalence ratio, 3.1; 99 percent confidence interval, 1.9 to 5.1); of the 91 men who had anal sex with other men, 42.9 percent were infected with HIV as compared with 9.3 percent of the 582 men who did not have anal sex with other men (prevalence ratio, 4.7; 99 percent confidence interval, 3.0 to 7.4). In multivariable analyses, these high-risk sexual practices accounted for the higher prevalence of HIV infection among the crack smokers, as compared with those who did not smoke crack. Women who had recently had unprotected sex in exchange for money or drugs were as likely to be infected as men who had had sex with men (40.9 percent vs. 42.9 percent).

CONCLUSIONS

In poor, inner-city communities young smokers of crack cocaine, particularly women who have sex in exchange for money or drugs, are at high risk for HIV infection. Crack use promotes the heterosexual transmission of HIV.

Potential for bias in studies of the influence of human immunodeficiency virus infection on the recognition, incidence, clinical course, and microbiology of pelvic inflammatory disease

As the human immunodeficiency virus (HIV) epidemic affects more women, clinicians are increasingly observing pelvic inflammatory disease (PID) in HIV-infected women. The extent to which PID is a factor in the recognition of HIV or HIV is a factor in the recognition of PID is unknown. Even less is known about how HIV infection influences the development, clinical course, and microbiology of PID. The paucity of existing data largely results from difficulties in designing studies that are free of bias. Several biases may distort studies of the effect of HIV on the recognition, incidence, clinical presentation and course, and microbiology of PID. Selection bias, diagnostic bias, and confounding bias are the most likely causes of invalid conclusions in studies of the influence of HIV infection on these aspects of PID, for three major reasons: Factors that determine patients' health care seeking behavior may be related to HIV status; the diagnosis of PID tends to be imprecise; and extraneous factors that cause or prevent PID may be distributed differently in HIV-infected and HIV-uninfected women. Appropriate study design and analytic techniques can eliminate, reduce, or estimate the magnitude and direction of these biases, thereby yielding more valid conclusions. To interpret properly existing and future studies of the influence of HIV infection on PID, clinicians must consider several biases that may distort results.

The effect of using different reference dates for control exposure measurement on relative risk estimates in a case-control study

In case-control studies in which case and control enrollment periods are not identical, exposure status for time-dependent variables is often measured relative to a reference date. Using data from a case-control study of the relation between cervical cancer and oral contraceptive (OC) use in which control enrollment began 6 months after the end of case enrollment, we evaluated the effect on odds ratios from using five different reference dates to determine the controls' exposure status. The choice of reference date had little effect on the odds ratios in this study. Reference dates for time-dependent exposure variables should be considered carefully in studies when case and control enrollment periods are not identical.

High-risk sex behavior among young street-recruited crack cocaine smokers in three American cities: an interim report. The Multicenter Crack Cocaine and HIV Infection Study Team

Since crack cocaine appeared in urban areas in the United States in the mid-1980s, reports have suggested that crack smokers may be at increased risk of sexually transmitted diseases (STDs), including infection with HIV, because they have multiple sex partners, trade sex for money or drugs, and rarely use condoms. A cross-sectional survey is being conducted in urban neighborhoods in Miami, New York and San Francisco--where crack use is common--to explore these issues. Indigenous street outreach workers are recruiting men and women who are either current regular crack smokers or who have never smoked crack; each group is further stratified according to whether participants had ever injected drugs. Participants were interviewed about their sexual and drug-use practices. Overall, crack smokers, whether injectors or not, engaged in higher-risk sexual behaviors than nonsmokers, reported greater numbers of sex partners than nonsmokers, and were more likely than nonsmokers to have exchanged sex for money or drugs or to have had an STD. Differences between crack smokers and nonsmokers were generally greater among non-injectors than among injectors, and generally greater among women than among men. Condom use, although somewhat more common with paying than nonpaying partners, was infrequent overall. Most of the subjects had not been in substance abuse treatment in the preceding 12 months, and a majority had never been in substance abuse treatment. Education and prevention programs specifically targeted at crack smokers not currently in substance abuse treatment are needed to reach these high-risk persons.

Sudden infant death syndrome in Washington State: why are Native American infants at greater risk than white infants?

Washington State reports one of the highest rates of sudden infant death syndrome (SIDS) in the United States; within the state, Native Americans have the highest rate of any racial group. To explore this apparent genetic predisposition, we conducted a population-based retrospective cohort study. Using the state's linked birth and death certificate file for 1984 to 1988, we compared infants whose mothers were coded as "American Indian" with infants whose mothers were coded as "white." Native American infants were more than three times more likely than white infants to die of SIDS (crude relative risk = 3.25; 95% confidence interval = 2.41 to 4.38). However, this elevated risk diminished after adjustment for differences between Native American and white mothers in age, marital status, parity, and smoking status during pregnancy (adjusted relative risk = 1.82; 95% confidence interval = 1.28 to 2.58). The high SIDS rate of Washington's Native Americans appears to be due to the high prevalence of SIDS risk factors among Native American mothers, rather than to a genetic predisposition in the infants. Because many of these maternal factors are related to socioeconomic status, it is likely that programs to improve the overall health of Native Americans might lessen both the impact of SIDS and that of other causes of infant morbidity and death.