Benefits of a rapid HIV test for evaluation of the source patient after occupational exposure of healthcare workers

Evaluation of the Performance of Health Extension Workers in HIV-1/2 Screening Tests: A Comparative Cross-Sectional Study, Addis Ababa, Ethiopia

Background

Human resources for health-care delivery are essential for attaining global health and development goals. Especially in developing countries, health extension workers are frontline health personnel who can play a key role in preventing and controlling HIV/AIDS. This study aimed to evaluate the performance of health extension workers in HIV-1/2 screening tests. Methodology. A comparative cross-sectional study was carried out to evaluate the performance of health extension workers in HIV-1/2 screening tests. Study participants had performed HIV screening tests on the prepared sample panels. Finally, the percentage of accuracy, error rate, sensitivity, specificity, predictive values, and measure of agreement (kappa) were calculated using SPSS version 26.

Result

Totally, 1600 HIV screening tests were performed, and of these, 684 and 235 tests were done by HEWs (n = 15) and laboratory personnel (n = 5), respectively, with three discordant results by HEWs from a single sample panel which was weak reactive for HIV antibody test. The sensitivity, specificity, PPV, and NPV of HIV screening tests by HEWs were 97.4%, 100%, 100%, and 97.22%, respectively, and 100% for all parameters when it is tested by laboratory professionals. The measure of kappa agreement was 0.971 (95% CI, 0.932–1) for HEWs and 1 for laboratory personnel compared with the reference result.

Conclusion

Based on this evidence, we conclude that the potential contribution of HEWs can be invaluable in the expansion of HIV screening tests nationwide to compensate the shortage of laboratory personnel.

HIV rapid screening tests and self-tests: Be aware of differences in performance and cautious of vendors

BACKGROUND

Rapid tests for HIV testing are essential tools to achieve the 90-90-90 target of the World Health Organization. Many tests are available, some directly from websites. Evaluation of the performance of rapid tests, under close to real-life usage, is therefore needed to ensure accurate diagnosis in the context of the recommendation for their more widespread use.

METHOD

Nine third- (3G) or fourth-generation (4G) rapid screening tests or self-tests (two bought on websites), were evaluated on an extensive panel of 200 HIV-negative and 312 HIV-positive samples, representative of a wide variety of clinical situations and HIV genetic diversity. A whole blood reconstitution protocol was designed to simulate real-life usage of these tests in community-based and private settings.

FINDINGS

The specificity was high (98.5-100%) and sensitivity excellent (100%) for samples from patients chronically infected with the pandemic strains. The performance for infrequent situations with a major epidemiological and clinical impact, such as infection with divergent viruses or primary infection, was highly variable, depending on the test. One of the two 4G tests allowed detection of additional positive samples from early stages of infection, whereas the second (sold as a 4G test on a website) corresponded in reality to a 3G test.

INTERPRETATION

Our study showed that not all tests are equal for the detection of major HIV variants or early stages of HIV infection; adding the detection of specific p24Ag improved the latter point. This study also showed, for the first time, that buying through web-based vendors can be risky, due to the varying performance of the tests and questionable sales practices. Our results are of particular importance in the context of the increasing use of rapid tests in an "outside laboratory" settings. FUND: Santé Publique France, COREVIH - Normandie, and Rouen University Hospital.

The INSTI HIV-1/HIV-2 antibody test: a review

INTRODUCTION

Rapid HIV tests have been widely adopted globally as an important component of HIV prevention and control programs. The INSTI™ HIV-1/HIV-2 antibody test is a second-generation HIV antibody test, available in most countries for use from whole blood, serum, and plasma.

AREAS COVERED

Available data on kit characteristics and current performance data on the INSTI™ HIV-1/HIV-2 antibody test are presented together with six other rapid point-of-care tests (RPOCTs) for HIV antibody. Few published data are available providing direct comparisons of INSTI™ with other RPOCTs for HIV antibody and standard laboratory-based HIV-1/HIV-2 antibody assays. Existing data showed that INSTI™ has comparable performance to other RPOCTs but detected seroconversion later than standard laboratory-based assays.

EXPERT OPINION

The good performance of INSTI HIV-1/HIV-2 antibody test, its ease of use, the rapid availability of results (< 5 min), and the lack of specialized equipment required to use the kit make this kit a useful addition to the global market. The unique antigen and flow through technology contained in the kit make it a strong addition to HIV RPOCTs and to rapid/rapid algorithms used in many resource-limited settings.

Community-based HIV and STI prevention in women working in indoor sex markets

Community research into women's experiences in the indoor commercial sex industry illustrated an urgent need for sexually transmitted infection (STI) and HIV education, prevention, testing, and treatment and culturally appropriate services to support the sexual and reproductive health of commercial sex workers (CSWs). This work also revealed that a high number of immigrant--primarily Asian--women are involved in the indoor sex industry. In response, the authors developed a community-academic research partnership to design and implement a blended outreach research program to provide STI and HIV prevention interventions for indoor CSWs and their clients. This Community Health Worker Model HIV Prevention and Health Promotion Program incorporated health education, primary care referrals, STI testing using self-swab techniques, and a point-of-care HIV screening test. Here the authors report on program implementation, design, and the experiences of participants and team members and provide research and vaccination recommendations for future work in this area. This work work affirms that community-based service providers can be a key entry point for indoor CSWs to access health care and sexual health promotion and education and may be a solution to missed opportunities to provide culturally and contextually appropriate education and services to this population.

HIV testing near the patient: changing the face of HIV testing

Virological, epidemiologic, and operational barriers have slowed the progress toward effective management and eradication of HIV infection, despite significant advances in diagnosis since the early 1980s. Because early diagnosis profoundly affects the health care and survival of infected/high-risk individuals, and because the time required for conventional testing remains a barrier in many settings, rapid HIV testing has been developed for use both in the clinical laboratory and at the point of care. Recent studies have identified applications, advantages, and limitations of these assays, which may influence the development of new and more effective public health testing and screening protocols. In the United States, the Food and Drug Administration has approved the use of six rapid HIV tests. This review summarizes these modern rapid point-of-care HIV tests and their role in preventing the spread of HIV and in detecting, managing, and treating patients affected by the HIV pandemic.

High risk for occupational exposure to HIV and utilization of post-exposure prophylaxis in a teaching hospital in Pune, India

Background

The risk for occupational exposure to HIV has been well characterized in the developed world, but limited information is available about this transmission risk in resource-constrained settings facing the largest burden of HIV infection. In addition, the feasibility and utilization of post-exposure prophylaxis (PEP) programs in these settings are unclear. Therefore, we examined the rate and characteristics of occupational exposure to HIV and the utilization of PEP among health care workers (HCW) in a large, urban government teaching hospital in Pune, India.

Methods

Demographic and clinical data on occupational exposures and their management were prospectively collected from January 2003–December 2005. US Centers for Diseases Control guidelines were utilized to define risk exposures, for which PEP was recommended. Incidence rates of reported exposures and trends in PEP utilization were examined using logistic regression.

Results

Of 1955 HCW, 557 exposures were reported by 484 HCW with an incidence of 9.5 exposures per 100 person-years (PY). Housestaff, particularly interns, reported the greatest number of exposures with an annual incidence of 47.0 per 100 PY. Personal protective equipment (PPE) was used in only 55.1% of these exposures. The incidence of high-risk exposures was 6.8/100 PY (n = 339); 49.1% occurred during a procedure or disposing of equipment and 265 (80.0%) received a stat dose of PEP. After excluding cases in which the source tested HIV negative, 48.4% of high-risk cases began an extended PEP regimen, of whom only 49.5% completed it. There were no HIV or Hepatitis B seroconversions identified. Extended PEP was continued unnecessarily in 7 (35%) of 20 cases who were confirmed to be HIV-negative. Over time, there was a significant reduction in proportion of percutaneous exposures and high-risk exposures (p < 0.01) and an increase in PEP utilization for high risk exposures (44% in 2003 to 100% in 2005, p = 0.002).

Conclusion

Housestaff are a vulnerable population at high risk for bloodborne exposures in teaching hospital settings in India. With implementation of a hospital-wide PEP program, there was an encouraging decrease of high-risk exposures over time and appropriate use of PEP. However, overall use of PPE was low, suggesting further measures are needed to prevent occupational exposures in India.

Three-year prospective study to improve the management of blood-exposure incidents

OBJECTIVE

Throughout 2003-2005, all blood-exposure incidents registered by an expert counseling center in The Netherlands accessible by telephone 24 hours a day, 7 days a week, were analyzed to assess quality improvement in the center's management of such incidents. The expert center was established to handle blood-exposure incidents that occur both inside and outside of a hospital. Infection control practitioners carried out risk assessment, made the practical arrangements associated with managing incidents, and carried out treatment and follow-up, all in accordance with standardized procedures.

DESIGN

We analyzed the time it took for exposed individuals to report the incident, the time required to perform a human immunodeficiency virus (HIV) test for the source individual when needed, occurrence of injuries, hepatitis B (HBV) vaccination status of exposed individuals, and adherence to protocol at the expert center.

RESULTS

A mean of 465 incidents was registered during each year of the 3-year study period. Although 698 (50%) of 1,394 reported exposures took place in a hospital, 704 (50%) took place outside of a hospital, and 460 (33%) occurred at a time other than regular office hours. HIV tests for source individuals were performed increasingly quickly over the course of the 3-year study period because of earlier reporting and improvements in practical matters associated with performing and processing the tests. The percentage of healthcare workers employed outside a hospital who were vaccinated against HBV increased from 34% (52 of 152) to 70% (119 of 170) during the 3-year study period. Consequently, the administration of immunoglobulin and unnecessary laboratory testing were reduced. In assessing the quality of the expert center, flaws in the handling of incidents were identified in 148 (37%) of 396 incidents analyzed in 2003, compared with 38 (8%) of 461 incidents analyzed in 2005.

CONCLUSIONS

The practical matters associated with management of blood-exposure incidents, such as timely reporting and administration of prophylaxis, should be optimized for incidents that occur at times other than regular office hours and outside of hospitals. The establishment of a 24-hour centralized counseling facility that was open 7 days a week to manage blood exposures resulted in significant improvements in incident management and better care.

Postexposure prophylaxis: a guide for prevention of human immunodeficiency virus transmission in orthopedic surgery

Approximately half of orthopedic surgeons reported operating on at least 1 patient with known HIV infection. Knowledge of postexposure prophylaxis guidelines may prevent HIV transmission and avert unnecessary exposure to antiretroviral agents.

Post-evaluation of rapid HIV kits in the Korean market by an anti-HIV EQAS panel

This study aimed to provide evaluation information about rapid HIV kits by the anti-HIV External Quality Assessment Schemes (EQAS) panel of the Korea National Institute of Health (KNIH) and the rapid HIV test panel of the US Centers for Disease Control and Prevention (CDC). Each KNIH anti-HIV EQAS panel from 2003 to 2005 consisted of four or five samples of plasma obtained from blood donors with a strong positive or negative reaction to HIV. KNIH delivered each panel to public health centers for analysis of the HIV test results, and the reactivity of the five rapid HIV kits currently used in the Korean market were compared with that of a CDC reference. The analytic sensitivity and specificity of the rapid HIV kits for the KNIH anti-HIV EQAS in 2005 were 99.3 and 99.1%, respectively; in 2004, 98.8 and 97.1%; and in 2003, 94.8 and 95.9%. Five HIV kits from the CDC panel consistently showed positive reactivity for strong positive samples in all kits, but some showed erratic reactivity for weakly positive samples. This is the first report on post-evaluation of rapid HIV kits in the Korean market by an anti-HIV EQAS panel. It was found that the quality of performance of the rapid HIV tests had improved each year but should be interpreted with caution for weakly positive samples.