Replacement of conventional HIV testing with rapid testing: mathematical modelling to predict the impact on further HIV transmission between men

Eradicating syphilis, hepatitis C and HIV in MSM through frequent testing strategies

PURPOSE OF REVIEW

The rates of sexual transmission of HIV, syphilis and hepatitis C in MSM are rising in most countries. Recent research has raised the question of whether increasing testing and treatment of these infections could substantially reduce their transmission.

RECENT FINDINGS

Although mathematical models suggest this strategy could be potentially effective in reducing transmission, there is currently very limited evidence that community-wide incidence has been curtailed by this strategy.

SUMMARY

If increasing in testing is to substantially reduce the incidence of these infections then significant increases in testing are required together with innovative approaches to testing and healthcare delivery. Notwithstanding this, relatively simple approaches to increasing testing are currently underutilized.

A review of the evidence of harm from self-tests

Although HIV self-testing may overcome some barriers to HIV testing, various stakeholders have expressed concerns that HIV self-testing may lead to unintended harm, including psychological, social and medical harm. Recognizing that similar concerns were raised in the past for some other self-tests, we conduct a review of the literature on a set of self-tests that share some characteristics with HIV self-tests to determine whether there is any evidence of harm. We find that although the potential for harm is discussed in the literature on self-tests, there is very little evidence that such harm occurs.

An evaluation of an express testing service for sexually transmissible infections in low-risk clients without complications

Background One effective way of reducing the prevalence of sexually transmissible infections (STIs) in a population is ensuring easy access to clinical services and screening of populations at high risk of STIs, including HIV. We aimed to describe the features of clients using the express testing service (ETS) and the overall impact on the service. Methods: This retrospective cross-sectional study involved all clients attending the walk-in triage service at Melbourne Sexual Health Centre before the introduction of ETS in 2009 and after ETS (2011 and 2012). Results: There were 32 720 and 82 265 consultations before and after ETS respectively. The ETS saw 4387 (9%) of 55 648 consultations (excluding appointments and results), giving rise to a fall in the proportion of lower-risk clients having full consultations (from 53% to 50% of consultations; P < 0.001). The consultations testing for HIV and chlamydia (Chlamydia trachomatis) were marginally higher (HIV: 48% v. 47%, P = 0.017; chlamydia: 70% v. 68%, P = 0.015) with ETS. Young (26 v. 27 years) females (38% v. 34%) utilised the ETS more (P < 0.001). The time taken for consultation and the total time spent in the clinic was significantly decreased during the ETS period (from 25 min to 6 min for consultation time and from 59 min to 29 min for total clinic time; P < 0.001). Conclusions: The data suggest that fast-track services such as ETS are effective in increasing access for higher-risk individuals while streamlining screening of asymptomatic low-risk clients.

Individual-based simulation models of HIV transmission: reporting quality and recommendations

BACKGROUND

Individual-based modeling is a growing technique in the HIV transmission and prevention literature, but insufficient attention has been paid to formally evaluate the quality of reporting in this field. We present reporting recommendations for individual-based models for HIV treatment and prevention, assess the quality of reporting in the existing literature, and comment on the contribution of this model type to HIV policy and prediction.

METHODS

We developed reporting recommendations for individual-based HIV transmission mathematical models, and through a systematic search, used them to evaluate the reporting in the existing literature. We identified papers that employed individual-based simulation models and were published in English prior to December 31, 2012. Articles were included if the models they employed simulated and tracked individuals, simulated HIV transmission between individuals in a particular population, and considered a particular treatment or prevention intervention. The papers were assessed with the reporting recommendations.

FINDINGS

Of 214 full text articles examined, 32 were included in the evaluation, representing 20 independent individual-based HIV treatment and prevention mathematical models. Manuscripts universally reported the objectives, context, and modeling conclusions in the context of the modeling assumptions and the model's predictive capabilities, but the reporting of individual-based modeling methods, parameterization and calibration was variable. Six papers discussed the time step used and one discussed efforts to maintain internal validity in coding.

CONCLUSION

Individual-based models represent detailed HIV transmission processes with the potential to contribute to inference and policy making for many different regions and populations. The rigor in reporting of assumptions, methods, and calibration of individual-based models focused on HIV transmission and prevention varies greatly. Higher standards for reporting of statistically rigorous calibration and model assumption testing need to be implemented to increase confidence in existing and future modeling results.

Provision of rapid HIV tests within a health service and frequency of HIV testing among men who have sex with men: randomised controlled trial

OBJECTIVE

To determine if the provision of rapid HIV testing to men who have sex with men attending a health service would increase their frequency of HIV testing over time.

DESIGN

Non-blinded randomised controlled trial.

SETTING

Public sexual health service in Australia.

PARTICIPANTS

Men who reported having a male sexual partner within the previous year and an HIV test within the previous two years. Of 400 men entered, 370 (92.5%) completed the study.

INTERVENTIONS

Men attending the service between September 2010 and March 2011 were randomised 1:1 to either ongoing access to rapid HIV testing obtained with finger prick or to conventional HIV serology with venepuncture, over 18 months.

MAIN OUTCOME MEASURE

The incidence of all HIV testing after enrolment, including testing outside the study clinic, analysed by intention to treat.

RESULTS

Of 200 men randomised to the rapid testing arm, 196 were followed for 288 person years. Of 200 men randomised to the conventional testing arm, 194 were followed for 278 person years. Median time since the last HIV test was six months for both arms. Men in the rapid test arm had 469 tests (mean 1.63 tests a year), and men in the conventional test arm had 396 tests (mean 1.42 tests a year); incidence rate ratio 1.15, 95% confidence interval 0.96 to 1.38; P=0.12. In a post hoc analysis, rates of initial HIV testing during follow-up were 1.32 and 1.01 tests a year, respectively (1.32, 1.05 to 1.65; P=0.02).

CONCLUSIONS

Provision of access to rapid HIV testing in a health service did not result in a sustained increase over time in HIV testing by men who have sex with men; however, the rate of initial HIV testing did increase by a third. Further research is required to determine how to achieve sustained increases in the frequency of HIV testing by populations at risk.

TRIAL REGISTRATION

ACTR No 12610000430033.

Gay and bisexual men's views on rapid self-testing for HIV

Thirty-one gay and bisexual men were interviewed on the acceptability, potential use, benefits and limitations of rapid self-testing for HIV in Australia. The majority of men supported the introduction of rapid self-testing, and would be likely to, or would use the tests for home use. However, most reported they would use them for interim testing and not to replace conventional blood testing at health services as they could not detect other sexually transmitted infections or provide the professional expertise and support provided at health services.

Social network and risk-taking behavior most associated with rapid HIV testing, circumcision, and preexposure prophylaxis acceptability among high-risk Indian men

Indian truck drivers and their younger apprentice drivers are at increased risk of HIV infection. We determine network and risk practices associated with willingness to adopt HIV prevention interventions currently not being used in India: rapid HIV testing, circumcision, and preexposure prophylaxis (PrEP) in order to inform the National AIDS Control Program (NACP). Truck drivers and truck cleaners were systematically recruited to participate in a social network and risk survey in Hyderabad, Southern India. Three separate composite measures of acceptability of rapid HIV testing, circumcision, and PrEP acceptability were utilized to independently assess the relationship of these prevention interventions with risk-practices and social network characteristics. An 89% participation rate yielded 1602 truck drivers and truck cleaners with 54.2% younger than 30 years of age and 2.8% HIV infected. Twenty-five percent of respondents reported sex with female sex workers (FSW) and 5% with men (MSM). Rapid testing, circumcision, and PrEP acceptability were 97.4%, 9.1%, and 85.9%, respectively. Participants reporting prosocial network characteristics were more accepting of rapid testing (adjusted odds ratio [AORs] 3.07-6.71; p<0.05) and demonstrated variable PrEP acceptability (AORs 0.08-2.22; p<0.001). Sex with FSWs was associated with PrEP acceptability (AOR 4.27; p<0.001); sex with MSM was associated with circumcision acceptability only (AOR 2.66; p<0.01). Social network factors and risk-practices were associated with novel prevention acceptability, but not consistently across intervention type and with variable directionality. The NACP will need to consider that intervention uptake may likely be most successful when efforts are targeted to individuals with specific behavior and social network characteristics.