COVID-19 Vaccine Uptake in Undocumented Latinx Patients Presenting to the Emergency Department

This cross-sectional study examines COVID-19 infection status, vaccination uptake, and perceptions about the vaccine among Latinx patients presenting to the emergency department in California.

Facemasks: Perceptions and use in an ED population during COVID-19

Study objective

Facemask use is associated with reduced transmission of SARS-CoV-2. Most surveys assessing perceptions and practices of mask use miss the most vulnerable racial, ethnic, and socio-economic populations. These same populations have suffered disproportionate impacts from the pandemic. The purpose of this study was to assess beliefs, access, and practices of mask wearing across 15 urban emergency department (ED) populations.

Methods

This was a secondary analysis of a cross-sectional study of ED patients from December 2020 to March 2021 at 15 geographically diverse, safety net EDs across the US. The primary outcome was frequency of mask use outside the home and around others. Other outcome measures included having enough masks and difficulty obtaining them.

Results

Of 2,575 patients approached, 2,301 (89%) agreed to participate; nine had missing data pertaining to the primary outcome, leaving 2,292 included in the final analysis. A total of 79% of respondents reported wearing masks “all of the time” and 96% reported wearing masks over half the time. Subjects with PCPs were more likely to report wearing masks over half the time compared to those without PCPs (97% vs 92%). Individuals experiencing homelessness were less likely to wear a mask over half the time compared to those who were housed (81% vs 96%).

Conclusions

Study participants reported high rates of facemask use. Respondents who did not have PCPs and those who were homeless were less likely to report wearing a mask over half the time and more likely to report barriers in obtaining masks. The ED may serve a critical role in education regarding, and provision of, masks for vulnerable populations.

Fear of discovery as a deterrent to undocumented Latinx immigrants' reporting of crimes and the effects of political rhetoric

OBJECTIVES

Comparing undocumented Latinx immigrants (UDLI), Latinx citizens/residents (LCR), and non-Latinx citizens/residents (NLCR), we sought to assess rates of crime victimization, fear of reporting crimes, causes of this fear, and whether political rhetoric from the U.S. President had changed the reporting of crimes.

METHODS

From October 2018 to February 2020, we conducted this in-person survey study, enrolling similar numbers of UDLI, LCR, and NLCR patients at two urban county hospital emergency departments (EDs) in San Francisco and Oakland, California. Our primary outcomes were responses to key survey questions regarding crime victimization, fear of reporting crimes and the effects of anti-immigrant rhetoric on reporting crimes.

RESULTS

Of 667 patients approached, 531 (80%) participated and six participants were excluded: 165 (31.3%) were UDLI, 183 (34.7%) were LCR, and 177 (33.6%) were NLCR. Similar percentages of UDLI (34%), LCR (32%), and NLCR (39%) knew of someone (themselves, friends, or family) who was a victim of a crime. Similar percentages of UDLI (41%), LCR (46%), and NLCR (41%) stated that these victims were afraid to report this crime to the police. The primary reason for this fear in UDLI was fear of discovery and deportation (30%). Similar percentages of UDLI (63%), LCR (58%), and NLCR (46%) ultimately reported the crime to the police. Most (85%) respondents had heard the U.S. President's statements about measures against immigrants; 54% reported that they believe that because of these statements, people are more afraid to report a crime to the police.

CONCLUSIONS

Fear of reporting crimes is common in ED patients. The most common fear in UDLI is fear of discovery and deportation. Political rhetoric against immigrants contributes to this fear.

The Rapid Evaluation of COVID-19 Vaccination in Emergency Departments for Underserved Patients Study

Study objective

Emergency departments (EDs) often serve vulnerable populations who may lack primary care and have suffered disproportionate COVID-19 pandemic effects. Comparing patients having and lacking a regular source of medical care and other ED patient characteristics, we assessed COVID-19 vaccine hesitancy, reasons for not wanting the vaccine, perceived access to vaccine sites, and willingness to get the vaccine as part of ED care.

Methods

This was a cross-sectional survey conducted from December 10, 2020, to March 7, 2021, at 15 safety net US EDs. Primary outcomes were COVID-19 vaccine hesitancy, reasons for vaccine hesitancy, and sites (including EDs) for potential COVID-19 vaccine receipt.

Results

Of 2,575 patients approached, 2,301 (89.4%) participated. Of the 18.4% of respondents who lacked a regular source of medical care, 65% used the ED as their usual source of health care. The overall rate of vaccine hesitancy was 39%; the range among the 15 sites was 28% to 58%. Respondents who lacked a regular source of medical care were more commonly vaccine hesitant than those who had a regular source of medical care (47% versus 38%, 9% difference, 95% confidence interval 4% to 14%). Other characteristics associated with greater vaccine hesitancy were younger age, female sex, Black race, Latinx ethnicity, and not having received an influenza vaccine in the past 5 years. Of the 61% who would accept a COVID-19 vaccine, 21% stated that they lacked a primary physician or clinic at which to receive it; the vast majority (95%) of these respondents would accept the COVID-19 vaccine as part of their care in the ED.

Conclusion

ED patients who lack a regular source of medical care are particularly hesitant regarding COVID-19 vaccination. Most COVID-19 vaccine acceptors would accept it as part of their care in the ED. EDs may play pivotal roles in COVID-19 vaccine messaging and delivery to highly vulnerable populations.

Anti-immigrant Rhetoric and the Experiences of Latino Immigrants in the Emergency Department

Introduction

Anti-immigrant rhetoric and increased enforcement of immigration laws have induced worry and safety concerns among undocumented Latino immigrants (UDLI) and legal Latino residents/citizens (LLRC), with some delaying the time to care.1 In this study, we conducted a qualitative analysis of statements made by emergency department (ED) patients – a majority of whom were UDLI and LLRC – participating in a study to better understand their experiences and fears with regard to anti-immigrant rhetoric, immigration enforcement, and ED utilization.

Methods

We conducted a multi-site study, surveying patients in three California safety-net EDs serving large immigrant populations from June 2017–December 2018. Of 1684 patients approached, 1337 (79.4%) agreed to participate; when given the option to provide open-ended comments, 260 participants provided perspectives about their experiences during the years immediately following the 2016 United States presidential election. We analyzed these qualitative data using constructivist grounded theory.

Results

We analyzed comments from 260 individuals. Among ED patients who provided qualitative data, 59% were women and their median age was 45 years (Interquartile range 33–57 years). Undocumented Latino immigrants comprised 49%, 31% were LLRC, and 20% were non-Latino legal residents. As their primary language, 68% spoke Spanish. We identified six themes: fear as a barrier to care (especially for UDLI); the negative impact of fear on health and wellness (physical and mental health, delays in care); factors influencing fear (eg, media coverage); and future solutions, including the need for increased communication about rights.

Conclusion

Anti-immigrant rhetoric during the 2016 US presidential campaign contributed to fear and safety concerns among UDLI and LLRC accessing healthcare. This is one of the few studies that captured firsthand experiences of UDLI in the ED. Our findings revealed fear-based barriers to accessing emergency care, protective and contributing factors to fear, and the negative impact of fear. There is a need for increased culturally informed patient communication about rights and resources, strategic media campaigns, and improved access to healthcare for undocumented individuals.

Feasibility and Acceptability of a Text Message-Based Intervention to Reduce Overuse of Alcohol in Emergency Department Patients: Controlled Proof-of-Concept Trial

Background

Emergency department (ED) patients have high rates of risky alcohol use, and an ED visit offers an opportunity to intervene. ED-based screening, brief intervention, and referral to treatment (SBIRT) reduces alcohol use and health care costs. Mobile health (mHealth) interventions may expand the impact of SBIRTs but are understudied in low-resource ED populations.

Objective

The objective of this study was to assess the feasibility of and patient satisfaction with a text-based mHealth extension of an ED screening program to reduce risky alcohol use in low-income, urban patients.

Methods

Research assistants screened a convenience sample of ED patients in person for risky alcohol use via the Alcohol Use Disorders Identification Test (AUDIT). Patients who reported AUDIT scores ≥8 and <20 were informed of their AUDIT score and risk. RAs invited patients with SMS text message–capable phones to receive mROAD (mobilizing to Reduce Overuse of Alcohol in the ED), an SMS text message–based extension of the ED screening program. mROAD is a 7-day program of twice-daily SMS text messages based on the National Institutes of Health’s Rethinking Drinking campaign. Participants were allocated to a control group (daily sham text messages without specific guidance on behaviors, such as “Thanks for taking part!”) or to the mROAD intervention group. Patients were interviewed at 30 days to assess acceptability, satisfaction, and changes in drinking behavior. Satisfaction was examined descriptively. Pre and post measurements of drinking behaviors and motivation were compared, as were differences in change scores between the intervention arms.

Results

Of 1028 patients screened, 95 (9.2%) exhibited risky alcohol use based on AUDIT, and 23/95 (24%) of those patients did not own an SMS text messaging–capable phone; this left 72/95 (76%) eligible patients. Among eligible participants, 48/72 (67%) agreed to enroll; 31/48 (65%) achieved follow-up (18/24 (75%) in the intervention group and 13/24 (55%) in the control group). Participants who completed follow-up reported high satisfaction. Changes in behavior were similar between the arms. Overall, the number of drinking days reported in the prior 30 days decreased by 5.0 (95% CI 1.7-8.3; P=.004), and the number of heavy drinking days decreased by 4.1 (95% CI 1.0 to 7.15, P=.01). Patients reported an 11-point increase (95% CI 2.6-20, P=.01, 10% overall increase) in motivation to change alcohol use via the Change Questionnaire. The were no statistical differences in drinking days, heavy drinking days, or motivation to change between the arms.

Conclusions

The mROAD trial was feasible. Over three-quarters of ED patients with risky alcohol use owned a text message–capable phone, and two-thirds of these patients were willing to participate; only 1 patient opted out of the intervention. Although 35% of patients were lost to follow-up at 30 days, those patients who did follow up had favorable impressions of the program; more than 90% reported that SMS text messages were a “good way to teach,” and 89% of intervention arm participants enjoyed the program and found that the messages were motivating. Both the mROAD and sham message groups showed promising changes in alcohol use and motivation to change. mROAD is a feasible intervention that may reduce rates of risky alcohol use in ED patients.

Trial Registration

ClinicalTrials.gov NCT02158949; https://clinicaltrials.gov/ct2/show/NCT02158949

Declared impact of the US President's statements and campaign statements on Latino populations' perceptions of safety and emergency care access

Statements about building walls, deportation and denying services to undocumented immigrants made during President Trump’s presidential campaign and presidency may induce fear in Latino populations and create barriers to their health care access. To assess how these statements relate to undocumented Latino immigrants’ (UDLI) and Latino legal residents/citizens’ (LLRC) perceptions of safety and their presentations for emergency care, we conducted surveys of adult patients at three county emergency departments (EDs) in California from June 2017 to December 2018. Of 1,684 patients approached, 1,337 (79.4%) agreed to participate: 34.3% UDLI, 36.9% LLRC, and 29.8% non-Latino legal residents/citizens (NLRC). The vast majority of UDLI (95%), LLRC (94%) and NLRC (85%) had heard statements about immigrants. Most UDLI (89%), LLRC (88%) and NLRC (87%) either thought that these measures were being enacted now or will be enacted in the future. Most UDLI and half of LLRC reported that these statements made them feel unsafe living in the US, 75% (95% CI 70–80%) and 51% (95% CI 47–56%), respectively. More UDLI reported that these statements made them afraid to come to the ED (24%, 95% CI 20–28%) vs LLRC (4.4%, 95% CI 3–7%) and NLRC (3.5%, 95% CI 2–6%); 55% of UDLI with this fear stated it caused them to delay coming to the ED (median delay 2–3 days). The vast majority of patients in our California EDs have heard statements during the 2016 presidential campaign or from President Trump about measures against undocumented immigrants, which have induced worry and safety concerns in both UDLI and LLRC patients. Exposure to these statements was also associated with fear of accessing emergency care in some UDLIs. Given California’s sanctuary state status, these safety concerns and ED access fears may be greater in a nationwide population of Latinos.

Updated recommendations of the International Dengue Initiative expert group for CYD-TDV vaccine implementation in Latin America

Dengue disease represents a large and growing global threat to public health, causing a significant burden to health systems of endemic countries. For countries considering vaccination as part of their Integrated Management Strategy for Prevention and Control of Dengue, the World Health Organization currently recommends the first licensed dengue vaccine, CYD-TDV for: individuals aged 9 years or above from populations with high transmission rates, based on either seroprevalence criteria or pre-vaccination screening strategies, and for persons with confirmed prior exposure to infection in moderate to lower transmission settings. This paper describes the main conclusions of the Sixth Meeting of the International Dengue Initiative (IDI) held in June 2018, following release of a new product label by the manufacturer, updated WHO-SAGE recommendations, additional scientific evidence on vaccine performance, and reports of experiences by implementing countries. Considerations were made regarding the need for improving the quality of epidemiological and surveillance data in the region to help define the convenience of either of the two vaccination strategies recommended by WHO-SAGE. Extensive discussion was dedicated to the pros and cons of implementing either of such strategies in Latin America. Although, in general, a seroprevalence-based approach was preferred in high transmission settings, when cost-effectivity is favorable pre-vaccination screening is a convenient alternative. Cost-effectiveness evaluations can assist with the decisions by public health authorities of whether to introduce a vaccine. Where implemented, vaccine introduction should be part of a public health strategy that includes the participation of multiple sectors of society, incorporating input from scientific societies, ministries of heath, and civil society, while ensuring a robust communication program.

Adhesion in hydrogel contacts

A generalized thermomechanical model for adhesion was developed to elucidate the mechanisms of dissipation within the viscoelastic bulk of a hyperelastic hydrogel. Results show that in addition to the expected energy release rate of interface formation, as well as the viscous flow dissipation, the bulk composition exhibits dissipation due to phase inhomogeneity morphological changes. The mixing thermodynamics of the matrix and solvent determines the dynamics of the phase inhomogeneities, which can enhance or disrupt adhesion. The model also accounts for the time-dependent behaviour. A parameter is proposed to discern the dominant dissipation mechanism in hydrogel contact detachment.

Fear of discovery among Latino immigrants presenting to the emergency department

OBJECTIVES

Recent legislation mandating reporting of undocumented immigrants may instill fear of discovery when they access emergency department (ED) services. The objectives of this study were to: 1) characterize the knowledge and beliefs of undocumented Latino immigrants (UDLI) about health care workers' reporting (or nonreporting) of illegal immigrants in the ED, 2) determine whether UDLI fear discovery when presenting to the ED, and 3) determine the nature and sources of this fear.

METHODS

This was a cross-sectional study of UDLI and two comparison groups conducted in two California county EDs, from November 2009 to August 2010. The authors interviewed a convenience sample of adult UDLI, Latino legal residents (LLR), and non-Latino legal residents (NLLR) using a structured instrument in their native language. The main outcome was fear of discovery among UDLI and the sources of that fear.

RESULTS

Of 1,224 patients approached, 1,007 (82.3%) were interviewed: 314 UDLI, 373 LLR, and 320 NLLR. The median age was 43 years (interquartile range [IQR] = 31 to 55 years), and 51% were male. UDLIs were less likely to speak English (14%, 95% confidence interval [CI] = 10% to 18%), have health insurance (39%, 95% CI 32% to 44%), or have a regular primary care provider (PCP; 39%, 95% CI = 34% to 45%), compared to LLR (English 56%, 95% CI = 51% to 61%; health insurance 50%, 95% CI = 45% to 55%; regular PCP 51%, 95% = CI 46% to 57%) and NLLR (English 95%, 95% CI = 92% to 97%; health insurance 49%, 95% CI = 43% to 54%; regular PCP 51%, 95% CI = 45% to 56%). Of the 16% of UDLI who stated that nurses and doctors treat undocumented immigrant patients differently than citizens, 41% (95% CI = 29% to 54%) reported less respect given to UDLI by staff. Thirty-two percent of UDLI had heard of Proposition 187, 13% believed hospital staff reported UDLI to immigration authorities, and 9% said they were asked about their citizenship status. Fear of coming to the hospital because of discovery was expressed by 12% (95% CI = 9% to 16%) of UDLI, with 42% (95% CI = 28% to 58%) citing discussions with friends/family, 32% (95% CI = 19% to 47%) citing media and 16% (95% CI = 7% to 30%) citing both as sources of this fear.

CONCLUSIONS

One in eight of UDLI presenting to the ED express fear of discovery and consequent deportation. Belief that medical staff report UDLI and recent immigration are risk factors for this fear. Family, friends, and media are the primary sources of these concerns.

The role of lubricin in the mechanical behavior of synovial fluid

Synovial fluid is a semidilute hyaluronate (HA) polymer solution, the rheology of which depends on HA-protein interactions, and lubricin is a HA-binding protein found in synovial fluid and at cartilage surfaces, where it contributes to boundary lubrication under load. Individuals with genetic deficiency of lubricin develop precocious joint failure. The role of lubricin in synovial fluid rheology is not known. We used a multiple-particle-tracking microrheology technique to study the molecular interactions between lubricin and HA in synovial fluid. Particles (200 nm mean diameter) embedded in normal and lubricin-deficient synovial fluid samples were tracked separately by using multiple-particle-tracking microrheology. The time-dependent ensemble-averaged mean-squared displacements of all of the particles were measured over a range of physiologically relevant frequencies. The mean-squared displacement correlation with time lag had slopes with values of unity for simple HA solutions and for synovial fluid from an individual who genetically lacked lubricin, in contrast to slopes with values less than unity (alpha approximately 0.6) for normal synovial fluid. These data correlated with bulk rheology studies of the same samples. We found that the subdiffusive and elastic behavior of synovial fluid, at physiological shear rates, was absent in fluid from a patient who lacks lubricin. We conclude that lubricin provides synovial fluid with an ability to dissipate strain energy induced by mammalian locomotion, which is a chondroprotective feature that is distinct from boundary lubrication.

Low-grade parasitaemias and cold agglutinins in patients with hyper-reactive malarious splenomegaly and acute haemolysis

A cluster of 16 cases of hyper-reactive malarious splenomegaly (HMS) with severe, acute haemolysis, from an isolated, Venezuelan, Yanomami population, was prospectively investigated. Nine (69%) of the 13 HMS sera investigated but only one (7%) of 14 control sera (P < 0.005) contained elevated titres (of at least 1:32) of complement-fixing IgM cold agglutinins (CA). The CA detected had specificity for both the I and i blood-group antigens (with a relative predominance of anti-I) and wide thermal stability. The mean reciprocal CA titre was much higher for the HMS sera than for the control samples (59.16 v. 2.28; P < 0.001). Indirect tests for antiglobulin were positive for two of the 13 HMS cases (but none of 14 controls) investigated; all of the direct tests for antiglobulin gave negative results. The seven HMS cases checked, using an assay based on a nested PCR which amplified species-specific ribosomal sequences from Plasmodium vivax or P. falciparum, each yielded the PCR product that indicated P. vivax infection. However, only six (25%) of the 24 control samples (collected, at the same time as the HMS samples, from asymptomatic adults from the same Yanomami population) were PCR-positive (P < 0.001). In some cases at least, the acute severe episodes of haemolysis occasionally seen in HMS appear to be associated with an auto-immune, cold-agglutinin-mediated response triggered by non-patent parasitaemias.

Six years of experience in laparoscopic surgery of esophageal achalasia

BACKGROUND

We show the experience of 6 years in laparoscopic surgical therapy of esophageal achalasia, performing of the Heller-Dor or Heller-Toupet operation, with particular regard to the technical aspect.

METHODS

One hundred and ten laparoscopic interventions were done between November 1995 and December 2001. We studied operative time in hiatus approach, esophagocardiomyotomy, transoperative endoscopy, and anti-reflux procedure. We also analyzed the relation between complications and clinical evolution of disease with clinical stage.

RESULTS

The mean surgical time of the intervention is 138 min, and it is significantly increased by transoperative endoscopic control; conversion to open surgery was not necessary. Clinical results are classified as excellent in 103 patients. Morbidity was 6%.

CONCLUSION

This surgical procedure is a first line in the treatment of esophageal achalasia. It is necessary to have special care in early diagnostic cases to avoid electrosurgical injury.

Acute parotitis due to dengue virus

Acute bilateral parotitis is a common clinical feature of various infectious and autoimmune, metabolic, and drug-related conditions. We describe a unique case of bilateral inflammatory enlargement of the parotid glands in an immunocompetent patient with dengue fever. Evidence of dengue virus in the saliva is also provided for the first time.

Leptospirosis in Latin America

Leptospirosis is a common disease in Latin America. Transmission to humans occurs by contact with water or soil contaminated with the urine of rodents, dogs, or livestock. Pathogenesis is still poorly understood, and bacterial toxin or virulence factors are probably responsible for many features of the disease. The anicteric form is the most frequent presentation, and its clinical picture resembles influenza or other acute febrile diseases. Icterohemorrhagic leptospirosis, or Weil's syndrome, represents the severe form of the disease. Its clinical picture is similar to bacterial sepsis and multiple organ involvement occurs, mainly in kidneys and lungs, and causes great morbidity and mortality. Death is often related to multiple organ failure and pulmonary hemorrhages. Diagnosis is based on serology or blood, cerebrospinal fluid and urine cultures in specific media. Treatment involves a combination of antibiotics and supportive measures.

Role of physician assistants in dialysis units and nephrology

We surveyed physician assistants who work in nephrology to report their experience level, primary employer, salary, job responsibilities, and job satisfaction. Additional data were obtained from the Nephrology Manpower Study. The 67 responding physician assistants of 97 surveyed have 10.8 +/- 6.5 years (mean +/- standard deviation) total experience (6.2 +/- 5.0 years in nephrology). Typically, nephrologists (56.1%) or hospitals (30.3%) employ them. The majority (74%) earn $49,999 to $75,000; 79.1% work in outpatient units, 52.4% in inpatient units, 52.4% in hospitals, 43.3% in outpatient offices, and 23.9% in transplant units. In outpatient units, they manage 111 +/- 111 patients, mostly in free-standing (71.1%), for-profit (69.7%), corporately owned (87.3%) units in urban (80%) or suburban (18%) areas. Most (>85%) manage all dialysis- and nondialysis-related problems, including health maintenance; 84.3% are contacted first by staff, and 78% see patients more often than physicians. Of nephrologists who responded to the Manpower Study, 8.9% work with physician assistants and 20.7% work with nurse practitioners. Nephrologists in academic practice or private nephrology groups are more likely to use physician assistants (P < 0.05) and nurse practitioners (P < 0.005) than those in solo practice or multispecialty groups. Nephrologists with physician assistants (33.8 +/- 19.5 v 41.7 +/- 16.8 h/wk) or nurse practitioners (35.8 +/- 18.1 v 42.7 +/- 16.9 h/wk) tended to spend less time in direct patient care than those without physician extenders (P < 0.001). Nephrologists with renal fellows, however, spent the least time of all in direct patient care (30.0 +/- 15.9 v 47.3 +/- 14.9 h/wk; P < 0.001). Physician assistants can perform nearly all the medical tasks in dialysis units. They may offer one approach to providing effective and complete care for patients if nephrology manpower becomes limited.

Antigenic diversity of hepatitis B virus strains of genotype F in Amerindians and other population groups from Venezuela

The adw4 subtype of hepatitis B virus (HBV) belongs to a unique genomic group (genotype F) representing the original HBV strains from the New World. Data regarding the prevalence of this subtype among HBV carriers in South America are, however, scarce, and those concerning HBV genotype F are based on only a few samples from Latin America. In this study, serum samples were obtained from 141 hepatitis B surface antigen (HBsAg) carriers from Amerindians and urban populations from Venezuela. The HBsAg subtype was identified with monoclonal antibodies in 105 samples, and the HBV genotype was identified by reverse-phase hybridization with DNA fragments in 58 samples. The adw4 subtype was highly prevalent in the population studied (75%); among the Amerindians, the prevalence was 97%. The adw2 subtype was also present (10%), while other subtypes (ayw3 and ayw4) were only occasionally found. The HBV subtype was associated with the expected genotype in most cases (80%), and thus genotype F was highly prevalent. Sequencing of viral strains that gave genotypes unpredicted by the HBsAg subtyping confirmed seven of them as belonging to not previously described genotype-subtype associations: namely, adw2 and ayw4 within genotype F.

Hepatitis B and hepatitis delta virus infection in South America

About 100,000 cases of acute hepatitis B virus (HBV) infection occur annually in South America. The overall prevalence of HBV infection in low risk populations ranges from 6.7% to 41%, while hepatitis B surface antigen (HBsAg) rates range from 0.4% to 13%. In high endemicity aboriginal or rural populations, perinatal transmission may play a major part in the spread of HBV. In urban populations, however, horizontal transmission, probably by sexual contact, is the predominant mode of spread, with higher rates of HBV positivity in lower socioeconomic groups. High risk populations such as health care workers and haemodialysis patients show higher rates of HBV infection than comparable populations elsewhere. The risk of posttransfusion hepatitis B remains high in some areas. Concomitant HBV infection may accelerate the chronic liver disease seen in decompensated hepatosplenic schistosomiasis. In the north, the prevalence of hepatitis delta virus (HDV) infection ranks among the highest in the world. In the south, the problem appears negligible although it is increasing within high risk urban communities. HDV superinfection has been the cause of large outbreaks of fulminant hepatitis. The cost of comprehensive or mass vaccination programmes remains unaffordable for most South American countries. Less expensive alternatives such as low dose intradermal schedules of immunisation have been used with success in selected adult subjects.

Salmonellal splenic abscess in the antibiotic era: a Latin American perspective

Ten cases of salmonellal splenic abscesses recently documented in various Latin American countries are discussed. All patients were adults; the mean age was 32.6 years, and there was a predominance of males (seven). Predisposing conditions were identified in four cases. All 10 cases were documented by diagnostic imaging techniques; in one case, exploratory diagnostic laparotomy was also performed. Splenectomy was performed on eight patients, while two other patients responded to long courses of intravenous antimicrobial therapy alone. One patient died as the result of perioperative splenic rupture, and two patients underwent second laparotomies because of left subphrenic abscesses. Except for one human immunodeficiency virus-infected individual, all patients were immunocompetent and had large solitary lesions. Salmonella typhi was the predominant organism isolated and was recovered in six of the 10 cases.

Depression, HIV dementia, delirium, posttraumatic stress disorder (or all of the above)

A 29-year-old single Puerto Rican woman with AIDS was admitted to the Medical Service for pneumonia, seen by the Psychiatric Consultation Service, an eventually transferred to the Inpatient Psychiatric Unit with several possible psychiatric diagnoses including major depression, HIV dementia, delirium, and posttraumatic stress disorder. These possibly coexisting and interacting syndromes are discussed by three psychiatrists, one of whom is also a board-certified neurologist. This case illustrates the combined contribution of organic and psychological factor to complex behavioral disorders, which are increasingly common in HIV infection.

Special aspects of hepatitis B virus and delta virus infection in Latin America

Viral hepatitis is a common condition in Latin America. Central and South American countries report several thousand new cases of viral hepatitis each year. This article reviews the hepatitis B virus and hepatitis delta virus infections as major public health problems in Latin America. Their causes, symptoms, and special problems related to these strains of hepatitis are discussed in detail.

Efficacy of ivermectin in the treatment of strongyloidiasis complicating AIDS

Nine adult male homosexuals who were infected with the human immunodeficiency virus (five with AIDS-defining conditions) and harbored Strongyloides stercoralis received ivermectin on a compassionate basis for persistent intestinal infection. Hyperinfection was present in all cases. Ivermectin was given either as a single oral dose (200 micrograms/kg) or on a multidose schedule (200 micrograms/kg.d) on days 1, 2, 15, and 16. All seven patients who received multiple doses showed sustained clinical and parasitological cure, whereas one of two patients who received single-dose therapy relapsed promptly and fatally. Remissions have been maintained for at least 7 months and up to 3 years of follow-up. Ivermectin appears promising in the treatment of strongyloidiasis in patients with AIDS. Because of the risk of hyperinfection and/or disseminated disease, multidose courses are warranted. We are not aware of other reports describing the efficacy of antiparasitic drugs for strongyloidiasis in patients with AIDS.

[Comparative efficacy of intradermal and intramuscular active immunization against hepatitis B with a recombinant vaccine. Preliminary results]

Preliminary results of a prospective, comparative and randomized study on 119 sero-negative volunteers with increased risk to acquire hepatitis B, aimed to evaluate the comparative efficacy of a recombinant vaccine administered either intramuscularly or intradermally, are discussed. A short vaccination schedule of three consecutive doses given on months 0, 1 and 2 was used. Distribution by sex and age for both groups was similar. Seroconversion and seroprotection rates were comparable (96% and 96% Vs. 98% and 93%, respectively). The geometric mean titre of anti-HBsAg in individuals immunized via I.M. (155 IU/L) was significantly higher to that of the I.D. group (71 IU/L). On the other hand, the rate of good response (> 100 IU/L) was also higher in the I.M. group (67% Vs. 39%). The percentage of good responder in women was consistently higher than in men for both groups (75% Vs. 13%, respectively). In 68 vaccinees, samples were obtained one year later. The levels of anti-HBsAg and the anamnesic response after a booster of the vaccine are currently being assayed.

Maintenance of Sparganum proliferum in vitro and in experimental animals

Successful in vitro and in vivo maintenance of Sparganum proliferum is described for the first time. Various experimental animals including hamsters, mice and a monkey were evaluated. Albino mice inoculated either subcutaneously or intraperitoneally allowed the survival and multiplication of larvae for as long as 72 weeks. Intensity of infection was proportional to the length of exposure; however, the number of larvae collected from inoculated animals varied widely when infection lasted for 6 or more months. Inoculation of single larval segments appears as effective as that of complete larvae. Although Minimal Essential Medium allowed the survival of S. proliferum for as long as 14 weeks, growth was observed only during the first 4 weeks of culturing. Despite initial in vitro growth of larvae, neither differentiation into a more developed stage nor multiplication was obtained.

Multifocal Salmonella splenic abscess in a HIV-infected patient

A case of spleen abscess complicating Salmonella bacteremia in a HIV-infected patient is reported for the first time. Chronic pancreatitis and the infection of a pre-existing pseudocyst of the pancreas tail might have been the predisposing factor. Infection developed before other AIDS criteria were evident in the patient. Splenectomy plus antibiotic therapy was required to eradicate the process. Salmonella enteritidis was cultured from two suppurated lesions of the excised organ.

Protracted outbreak of severe delta hepatitis: experience in an isolated Amerindian population of the Upper Orinoco basin

In an investigation of a 21-year-old epidemic of severe hepatitis, 80 serum samples were studied from two isolated Yanomami Amerindian populations of the Upper Orinoco basin in Venezuela. Of the assayed samples, 30.6% were positive for hepatitis B surface antigen (HBsAg), 53.7% were considered to reflect immunity to infection with hepatitis B virus (HBV), and only 16.2% were believed to reflect susceptibility to HBV infection; 82.5% of the samples tested positive for any marker of HBV infection. Thirty-one (39.7%) of 78 samples were also positive for antibody to delta antigen, including 91.6% of those positive for HBsAg and 20.9% of those immune to HBV. Our findings provide evidence of a high prevalence of HBV infection in this population. Furthermore, the high prevalence of antibody to delta antigen strongly suggests that coinfections with HBV or superinfections with hepatitis delta virus (HDV) in HBV carriers may be an important factor in the occurrence of an unusually high number of cases of fulminant hepatitis and of chronic liver disease. Serum samples obtained at the beginning of the outbreak 13 years earlier from 36 selected cases in the same population revealed a high rate of HBV infection (96.5%). All six HBsAg carriers from whom enough serum remained to be assayed were positive for antibody to delta antigen. Our findings indicate that the outbreak coincided with the introduction of HDV into a population with an already-high prevalence of HBV infection.

Effect of priming with carrier on response to conjugate vaccine

To examine whether prior immunity against a carrier protein modulates the serological response to injected peptide haptens attached to the same carrier in man, baseline tetanus antitoxin levels in volunteers who received a malaria sporozoite peptide-tetanus toxoid conjugate vaccine were compared with post-vaccination IgM and IgG antibody titres against the sporozoite antigen. In tetanus-vaccinated North American recipients of low doses of conjugate vaccine there were significant dose-dependent negative correlations between these variables, which suggests that epitopic suppression may occur in man. In contrast, Venezuelans living in non-malarious areas and mostly naive to tetanus toxoid showed a notable IgM response to the sporozoite antigen. The findings indicate that epitopic suppression and immune enhancement occur in man, and that the specific immunological responses to conjugate peptide vaccines may be difficult to predict.

Antimicrobial activity of lomefloxacin (NY-198, SC 47111) against bacterial strains from Venezuela

Lomefloxacin (SC 47111, NY-198) is a recently developed difluorinated quinolone that has been reported to be active against a broad range of both gram-positive and gram-negative pathogens in a number of laboratories around the world. Our laboratory tested the in vitro activity of 451 recent bacterial isolates compared to that of cephradine and gentamicin to define the in vitro spectrum of activity of this compound versus bacterial isolates from Venezuela. Lomefloxacin showed excellent in vitro activity versus Enterobacteriaceae with all isolates inhibited at a concentration of less than or equal to 2 mcg/ml. Lomefloxacin also had significant activity versus the aerobic gram-negative rods tested; the MIC90 for Pseudomonas aeruginosa being 4 mcg/ml. The activity of lomefloxacin versus gram-positive isolates was comparable to that of the gram-negative organisms. The MIC90 for S. aureus, S. epidermidis, and Group D Streptococcus were 1, 0.5 and 4 mcg/ml, respectively. The results of this study confirm the broad spectrum in vitro activity of lomefloxacin seen in earlier studies. Lomefloxacin appears to be active versus a wide variety of both gram-negative and gram-positive isolates including those resistant to cephradine and gentamicin. The excellent in vitro activity of lomefloxacin seen in this study shows that this compound could be a useful addition to currently available antimicrobial agents.

Treatment of cutaneous larva migrans with albendazole. Preliminary report

Twenty three patients with Cutaneous Larva Migrans syndrome were prospectively treated with 400 mg/day of Albendazole for 3 consecutive days. Clinical response, compliance and tolerance was excellent. Patients were asymptomatic within the first 72 hours of treatment and recurrences did not occurred. Preliminary results with three additional patients suggest that a single oral 400 mg dose may be effective as well.

Seizures and praziquantel. A case report

A 27 year Old male developed seizures after receiving a single 20 mg/kg dose of praziquantel for the treatment of an intestinal Hymenolepis nana infection. On further clinical and laboratorial evaluations, he was found to suffer from an until then asymptomatic parenchymal brain cysticercosis. Praziquantel must be used with caution in those areas where cysticercosis represents a mayor public health problem. The occurrence of unexpected seizures in an individual being treated with the compound, must prompt clinicians to rule out cysticercosis of the CNS.

In vitro sensitivity of Mycobacterium marinum to minocycline and doxycycline

Using a Steers replicator technique the in vitro sensitivities of 32 clinical isolates of Mycobacterium marinum to doxycycline and minocycline were tested. Of 32 strains, sensitivity to doxycycline ranged from 3 strains (9%) with a drug concentration of 2 microgram/ml to 11 strains (34%) at a concentration of 6 microgram/ml. Sensitivity to minocycline ranged from 2 strains (6%) at the 2microgram/ml concentration to 23 strains (72%) at the 8 microgram/ml concentration. Our data suggest that a significant percentage of M. marinum strains are sensitive to therapeutically achievable levels of doxycycline and minocycline. These drugs may prove clinically useful in treating infections caused by sensitive strains of M. marinum.