HIV self-testing has become a cornerstone strategy for reaching people who face barriers to conventional clinic-based services. In Cameroon, both same-sex practices and sex work are criminalised, and the resulting stigma and fear of disclosure deter many men who have sex with men and female sex workers from visiting health facilities for testing. Self-testing sidesteps that obstacle: participants collect a small blood sample themselves, apply it to a rapid diagnostic strip, and read the result privately. Crucially, the test functions as a triage tool rather than a definitive diagnosis, meaning any reactive result must be confirmed through standard laboratory algorithms before treatment can begin.

The study enrolled 789 participants through 17 community-based organisations, ten serving men who have sex with men and seven serving female sex workers, in the two largest cities. All participants were aged 21 or older and were recruited through voluntary sampling. After counselling, each person performed an unassisted self-test and completed a structured questionnaire covering demographic characteristics, sexual behaviour, and medical history. The researchers then used modified Poisson regression, a statistical approach suited to common outcomes in cross-sectional data, to calculate adjusted prevalence ratios that quantify how each factor relates to the probability of a reactive test while controlling for other variables.

The headline finding is sobering: 23.3 percent of all participants had a reactive self-test, with a 95 percent confidence interval of 20.5 to 26.4 percent. The proportions were nearly identical across the two populations, at 23.2 percent among female sex workers and 23.4 percent among men who have sex with men, suggesting that both groups carry a comparably heavy and previously underappreciated burden of presumed infection. Because reactive self-tests require confirmatory testing, these figures represent an upper signal of infection prevalence rather than confirmed diagnoses, but the sheer scale of reactivity underscores how much undiagnosed infection may be circulating within networks that clinics rarely reach.

Perhaps the most dramatic signal in the data is geographic. Reactivity was more than three times higher in Yaoundé, the capital, than in Douala, the country’s economic hub, at 38.3 percent versus 12.2 percent. After statistical adjustment, living in Douala was associated with a 78 percent lower probability of reactivity among female sex workers and a 69 percent lower probability among men who have sex with men. This concentration in a single city is epidemiologically significant because it implies that tailored interventions, from intensified testing campaigns to partner services and pre-exposure prophylaxis roll-out, could achieve disproportionate impact if prioritised in Yaoundé rather than spread evenly across both metropolises.

Education emerged as a powerful and consistent protective correlate, particularly among women. Relative to female sex workers with no formal schooling, those with primary education had a 72 percent lower adjusted probability of a reactive test, those with secondary education a 66 percent lower probability, and those with higher education a 56 percent lower probability. A similar gradient appeared among men who have sex with men, where secondary education was associated with a 63 percent reduction. The pattern likely reflects the ways literacy and schooling shape access to health information, negotiating power in commercial sex, economic alternatives, and familiarity with preventive technologies, though the cross-sectional design cannot disentangle the underlying mechanisms.

Behavioural and clinical history markers also carried important signals. Among female sex workers, a history of symptoms suggestive of sexually transmitted infections nearly tripled the adjusted probability of reactivity, tripling the odds relative to women without such a history. This finding aligns with well-established virology: genital ulceration and inflammation amplify both acquisition and transmission of HIV by recruiting activated CD4-bearing target cells to mucosal surfaces and disrupting epithelial barriers. It also suggests that syndromic STI screening, when integrated with self-testing programmes, could serve as an efficient triage layer identifying women at highest risk.

Among men who have sex with men, each additional sexual partner over the preceding six months was associated with a modest but statistically reliable 3 percent increase in the probability of reactivity, a dose-response relationship consistent with cumulative exposure risk. Interestingly, alcohol consumption was associated with a 35 percent lower adjusted probability of reactivity in this group. The authors caution that such counterintuitive associations in cross-sectional data may reflect residual confounding or complex social patterns rather than any protective biological effect of alcohol itself.

The methodological strength of the study lies in its scale, its reliance on trained community-based organisations to recruit criminalised populations that formal health systems typically miss, and its use of regression techniques appropriate for high-prevalence outcomes. The ethical scaffolding was equally careful: the protocol received approval from Cameroon’s National Ethics Committee for Human Health Research and administrative authorisation from the Ministry of Health, and every participant provided written informed consent, with data handled confidentially given the acute legal risks these populations face.

The implications for public health strategy are direct. The authors conclude that reactive self-tests were frequent among both populations, with a marked concentration in Yaoundé and among unschooled female sex workers, and they argue that geographically prioritised, differentiated prevention, combined with STI screening and robust linkage to confirmatory testing, would meaningfully reduce this burden. As Cameroon and its regional neighbours work toward UNAIDS testing and treatment targets, the study demonstrates that self-testing is not merely a convenience but a surveillance instrument, capable of mapping where infection concentrates and guiding resources to the people and places that need them most.

Subject of Research: Factors associated with reactive HIV self-test results among female sex workers and men who have sex with men in Cameroon

Article Title: Factors associated with a reactive HIV blood self-test result among female sex workers and men who have sex with men in Yaoundé and Douala, Cameroon: a cross-sectional study

Article References: Ndié, J., Noah, J.-P. Y. A., Ndongo, F. A., Dongmo, R. K., Yongwa, O., Tchikangni, G., Palisson, T. A. N., Ketchaji, A., Yepndo, C. D., Ndindjock, C. B., IV, Tabala, F. N., Bonyohe, M., Moulioum, F., Nzaddi, A. R. D., Monteh, C. T., Mboussam, P. H., Nguemkam, G., Seukam, B., Anaba, E. D. M., … Bissek, A. C. Z.-K. (2026). Factors associated with a reactive HIV blood self-test result among female sex workers and men who have sex with men in Yaoundé and Douala, Cameroon: a cross-sectional study. BMC Infectious Diseases. https://doi.org/10.1186/s12879-026-14598-4

Image Credits: AI Generated

DOI: 10.1186/s12879-026-14598-4

Keywords: HIV self-testing, HIV, Cameroon, men who have sex with men, female sex workers, key populations, prevalence, Yaoundé, Douala, sexually transmitted infections, public health, cross-sectional study

PrEP, the use of antiretroviral medication by HIV-negative individuals to prevent infection, has transformed prevention science since its regulatory approval. When taken as prescribed, oral PrEP reduces the risk of acquiring HIV through sexual exposure by around 99 percent, a level of efficacy that has made it a cornerstone of global efforts to end the AIDS epidemic. Yet the roll-out of PrEP has been uneven worldwide, and the Asia-Pacific region, home to diverse epidemics concentrated among specific populations, presents a particularly complex picture. The new study set out to quantify whether national laws and policies affecting those populations correlate with whether PrEP is reported as available at all.

The research team used a cross-national ecological design, drawing entirely on secondary data that countries submit to UNAIDS, the Joint United Nations Programme on HIV/AIDS. Rather than collecting new survey data, the investigators extracted country-level indicators covering laws, legal protections, and the participation of key populations in the development of HIV-related policies. This approach allowed them to construct a standardized legal-policy profile for each of the 40 countries, but it also means the analysis captures associations at the population level rather than causal relationships at the individual level.

The indicators focused on four groups that UNAIDS classifies as key populations because they bear a disproportionate share of HIV burden: people who inject drugs, female sex workers, transgender people, and men who have sex with men. In total, 22 indicators were compiled, with seven covering people who inject drugs, four covering female sex workers, six covering transgender people, and five covering men who have sex with men. These indicators were combined into cumulative legal-policy scores for each country, with a maximum possible score of 22. Higher scores reflected legal environments with more punitive or restrictive provisions affecting key populations, alongside weaker protections and less meaningful participation of those communities in policy-making.

Countries were then sorted into three categories based on their reported PrEP status: those reporting PrEP availability, those reporting non-availability, and those that did not report PrEP status at all. The distribution itself is telling. Only 12 of the 40 countries reported that PrEP was available, 14 reported it was not available, and another 14 provided no report on PrEP status whatsoever. In other words, fewer than a third of the countries in the analysis could confirm that this highly effective prevention tool had reached their health systems, at least as reflected in UNAIDS reporting.

The mean cumulative legal-policy scores revealed a sharp divide. Countries reporting PrEP availability had a mean score of 8.92, while countries reporting non-availability averaged 10.07. Countries with no reported PrEP data, however, averaged just 1.71, a dramatic drop that the authors describe as structurally suggestive. The one-way analysis of variance, or ANOVA, used to compare mean scores across the three groups found statistically significant differences, with the Bonferroni post-hoc test indicating that the overall difference was driven primarily by the countries with non-reported PrEP data.

That statistical pattern carries an important interpretive caution. The scores of countries reporting PrEP availability and those reporting non-availability were relatively close to each other, both sitting in the range of roughly nine to ten points on the 22-point scale. The outlier was the non-reporting group. The authors conclude that non-reporting of PrEP, when it coincides with non-reporting of legal-policy indicators, points to possible links with unfavourable legal contexts and limited prevention readiness rather than representing a neutral data gap. In their framing, the absence of data is not random noise; it is a signal that clusters with the weakest legal protections for key populations.

This finding resonates with a well-documented body of public health evidence. Criminalisation of drug use, sex work, and same-sex relations is known to push key populations away from health services, increase stigma, and complicate the work of community-based organisations. Where laws are punitive, governments may also lack the political infrastructure or willingness to establish PrEP programmes, to collect data about them, or to report that data transparently to international bodies. The ecological design of this study cannot establish which of these mechanisms is at work, but the correlation between the lowest legal-policy scores and complete non-reporting is consistent with the idea that legal environments shape not only service delivery but also the visibility of prevention efforts in global monitoring systems.

The methodological strengths of the analysis lie in its breadth and its use of standardized international reporting. By relying on UNAIDS submissions, the study avoids the inconsistencies that arise when researchers assemble data from heterogeneous national sources, and the 22-indicator framework provides a quantifiable, reproducible measure of legal vulnerability across four distinct populations. The use of ANOVA with Bonferroni correction reflects a conservative approach to statistical testing, reducing the risk of false positives when comparing multiple groups. At the same time, the authors and readers alike must bear in mind the inherent limits of ecological inference: country-level averages cannot reveal how laws affect any individual’s access to PrEP, and the cross-sectional design captures a single moment rather than change over time.

The implications for policy are nonetheless direct. If non-reporting signals weak prevention readiness, then international monitoring frameworks may need to treat missing PrEP data as a red flag rather than a blank cell. The study’s authors suggest that their findings point to possible links between unfavourable legal contexts and limited prevention infrastructure, underscoring the argument that expanding PrEP in the Asia-Pacific region will require more than drug procurement and clinical guidelines. It will require legal reform, protection of key populations, and their genuine participation in shaping HIV policy. As the global community pursues targets for ending AIDS as a public health threat, this analysis of 40 countries makes clear that the law, and even the decision of whether to report at all, may be as decisive as any pill.

Subject of Research: The relationship between national legal policy environments and reported PrEP availability for key populations across Asia-Pacific countries

Article Title: An ecological analysis of legal policy environments and reported pre exposure prophylaxis availability for key populations in Asia Pacific countries

Article References: An ecological analysis of legal policy environments and reported pre exposure prophylaxis availability for key populations in Asia Pacific countries. (n.d.). https://doi.org/10.1007/s44155-026-00459-7

Image Credits: AI Generated

DOI: 10.1007/s44155-026-00459-7

Keywords: HIV, PrEP, pre-exposure prophylaxis, key populations, criminalisation, legal and policy environment, Asia-Pacific, UNAIDS, HIV prevention, men who have sex with men, transgender people, people who inject drugs

The scale of the challenge is considerable. Nigeria is home to roughly two million people living with HIV, the second-largest such population in the world. With the global target of ending HIV/AIDS set for 2030, the authors note that only a few years remain, and a single policy factor continues to compromise that timeline: the legal treatment of sex work as a criminal matter. Nigeria’s legal landscape is fragmented, with southern states punishing allied activities such as pimping and brothel-keeping, while northern states, applying versions of Sharia law, criminalise prostitution outright. This patchwork, the authors argue, creates an environment in which poor health outcomes and economic inefficiency flourish together.

The epidemiological logic of the critique is straightforward. Criminalisation drives sex work underground, where stigma and the persistent fear of arrest deter people from seeking HIV testing, prevention tools, and treatment. Studies cited in the commentary document that sex workers in Nigeria are frequently refused care by healthcare providers and routinely avoid health services out of fear of police encounters. This is despite the existence of the Nigerian HIV and AIDS (Anti-Discrimination) Act of 2014, which was intended to prohibit discrimination based on real or perceived HIV status. In practice, the authors observe, sex workers remain discriminated against by the very systems that are supposed to protect them, and enforcement activities themselves are associated with violence, extortion, and human rights abuses.

The numbers illustrate the consequences. A 2023 review of HIV trends in Nigeria reported a cumulative HIV prevalence of 10.8 percent among key populations in Kano State, dramatically higher than in the general population, with stigma and insufficient services identified as major barriers to care. Because criminalisation obstructs access to the very interventions that prevent and treat HIV, the commentary argues, it directly drives new infections and keeps the epidemic concentrated and expensive to manage. Treating advanced HIV disease, managing opportunistic infections, and funding long-term antiretroviral therapy and hospitalisations cost far more than preventive care would, meaning the current legal framework effectively forces Nigeria to spend more money for worse outcomes.

The fiscal dimension is central to the authors’ case. The Nigerian government and major international funders, including PEPFAR and the Global Fund, have invested heavily in HIV prevention programmes. Yet when one of the most vulnerable populations cannot safely access those programmes, the return on investment collapses. Police raids, detentions, and the cost of running detention facilities for arrested sex workers consume taxpayer money and law-enforcement capacity that the authors describe as counterproductive, straining an already overstretched judicial system. Decriminalisation, by contrast, would relieve pressure on the courts and police, freeing funds that could be redirected toward healthcare and reducing the sexual and gender-based violence documented during law-enforcement operations.

The commentary is careful to distinguish decriminalisation from legalisation, a distinction with significant practical implications for Nigeria. Legalisation typically involves formal state regulation through registration and licensing schemes, which can improve labour standards in theory but, in a politically conservative society, risks driving sex workers further underground if they are unwilling to identify themselves to authorities. Decriminalisation, as defined by the Global Network of Sex Work Projects, means the complete removal of criminal and administrative penalties against the sale and purchase of sex, advertising, solicitation, and third-party involvement, eliminating extraordinary policing and surveillance. International evidence, including a major global epidemiological review published in The Lancet, links decriminalisation to reduced HIV risk environments and increased uptake of services among sex workers, making it the more context-appropriate reform for Nigeria.

From a programmatic standpoint, decriminalisation would transform how prevention reaches the population that needs it most. The authors point to evidence that Nigerian sex workers are eager to engage with prevention: in one recent study, 95.9 percent obtained HIV testing when it was available, and 68 percent used pre-exposure prophylaxis, or PrEP, when it was accessible. Removing the threat of arrest would allow health authorities to systematically supply and track tools such as PrEP and condoms, and to establish regular testing within sex worker communities rather than relying on ad hoc, low-trust outreach. Instead of being treated as a public health liability, sex workers would be integrated into the healthcare system, with unhindered access to sexual and reproductive health programmes.

The economic argument extends beyond the health budget. The authors highlight an emerging contradiction in Nigerian policy: recent government proposals to tax all income, including earnings from sex work, sit awkwardly alongside laws that criminalise that same income. Decriminalisation would resolve this contradiction, bringing an active segment of the informal economy into the tax base and generating revenue that could be invested in public health programmes, including HIV prevention and sexual health clinics. Economic empowerment effects would follow, the authors argue, as sex workers gained the ability to demand fair pay and safer working conditions, spend less on bribes to law enforcement, negotiate condom use more effectively, refuse dangerous clients, and reduce their exposure to violence and abuse.

The commentary also addresses a common counterargument: that economic and educational exit programmes are a preferable empowerment strategy in conservative societies. The authors acknowledge that such programmes can help some women transition out of sex work, citing studies from Africa and Canada, but note that in criminalised environments their effectiveness is limited by legal precarity, violence, and stigma, and that the best results come from integrated, voluntary, rights-based support rather than stand-alone exit mandates. Decriminalisation, in their framing, is best understood as a structural harm-reduction reform that enhances the reach and effectiveness of every other intervention.

Ultimately, the authors present Nigeria with a clear choice. The country can continue along an expensive and futile path of criminalisation that feeds the epidemic it claims to fight, or it can adopt a realistic, health-centred policy of decriminalisation. They are explicit that decriminalising sex work should not be read as an endorsement of the profession but as an acknowledgement that containing HIV requires unimpeded access to prevention and care, unobstructed by law. Framed as an investment in public health, the reform promises lower infection rates, more efficient use of national and donor funds, and meaningful progress toward ending AIDS by 2030. From a health economics standpoint, the authors conclude, it is an investment Nigeria cannot afford to postpone.

Subject of Research: Health economics analysis of sex work decriminalisation and its impact on HIV prevalence in Nigeria

Article Title: Decriminalising sex work and the health economics impact on HIV prevalence in Nigeria

Article References: Decriminalising sex work and the health economics impact on HIV prevalence in Nigeria. (n.d.). https://doi.org/10.1007/s44155-026-00452-0

Image Credits: AI Generated

DOI: 10.1007/s44155-026-00452-0

Keywords: sex work decriminalisation, HIV prevalence, Nigeria, health economics, PrEP, HIV prevention, key populations, stigma, public health policy, harm reduction, PEPFAR, Global Fund