I think that contact with scientists - John Rubaihayo and

Nazarius Mbona Tumwesigye - will be helpful. You can find them in researchgate network (links in attachment).

https://www.researchgate.net/profile/John_Rubaihayo

https://www.researchgate.net/profile/Nazarius_Tumwesigye

Dear Dr Malachi,

I recommend you look at the website of the Global Forum for MSM and HIV - www.msmgf.org - which has a number of articles in its database on this subject. You can also email them.

The major problem is providing access to HIV/AIDS services for those people. This is the key solution to the question. 

The key is to outreach the population. In Guatemala, we're building an experience to increase coverage in MSM. Is important to mention that in Guatemala isn't an unfreandly legal system for LGBTI, however stigma is a major concern in our context.

The close work with a community based organization, and promotion through social network as Facebook, Twitter; and "gay apps" such as Grindr and Manhunt; are an important strategy to contact MSM. 

Also, Mpowerment model 

Here are some publications that may help you:

Goldenberg T, McDougal JS, Sullivan SP, Stekler DJ, Stephenson R. Preferences for a Mobile HIV Prevention App for Men Who Have Sex With Men. JMIR mHealth uHealth [Internet].

Young SD, Szekeres G, Coates T. The Relationship between Online Social Networking and Sexual Risk Behaviors among Men Who Have Sex with Men (MSM). PLoS One. 2013;8(5):15–8.

Usher D, Frye V, Shinnick J, Greene E, Baez E, Benitez J, et al. Recruitment by a Geospatial Networking Application for Research and Practice: The New York City Experience. JAIDS J Acquir Immune Defic Syndr [Internet]. 2014;67(5).

Suthar AB, Ford N, Bachanas PJ, Wong VJ, Rajan JS, Saltzman AK, et al. Towards Universal Voluntary HIV Testing and Counselling: A Systematic Review and Meta-Analysis of Community-Based Approaches. PLoS Med. 2013;10(8).

Kegeles SM, Hays RB, Coates TJ. The Mpowerment project: A community-level HIV prevention intervention for young gay men. Am J Public Health. 1996;86(8 I):1129–36.

Kahn JG, Kegeles SM, Hays R, Beltzer N. Cost-Effectiveness of the Mpowerment Project, a Community-Level Intervention for Young Gay Men. JAIDS J Acquir Immune Defic Syndr [Internet]. 2001;27(5)

Thank you all for these very helpful responses, I am going through the links and the articles.

in Brazil sexual minorities have been protected by defobsaúde programs and DST / AIDS, working with the concept of vulnerabilidae, and several anti-homophobia laws that have been created locally. Transsexuals even now can perform sex change by the public health system, despite this service only being offered in one state, and court decisions that have favored the exchange of company names on records and civil records.

In general, It's important to know someone who has access to these populations. Knowing one person generally opens the door for more as long as their privacy is respected.

Thank you Regina for sharing the experience in Brazil, it is interesting to hear the developments. Yes Christophe thank you too for that vital piece of advice. 

Maybe this should help. I am member of  IAPAC, in case you need more info

http://www.iapac.org/uploads/JIAPAC-IAPAC-Guidelines-for-Optimizing-the-HIV-Care-Continuum-Supplement-Nov-Dec-2015.pdf

Very informative recommendations. Thanks Carlos