Rwanda Zambia HIV Research Group | 1,524 followers on LinkedIn. The Rwanda Zambia HIV Research Group (RZHRG) has been a global leader in the fight against HIV/AIDS for more than 25 years, supporting Couples' Voluntary Counseling and Testing (CVCT) throughout sub-Saharan Africa. CVCT is proven to reduce the transmission of HIV by more than two-thirds among those couples who do not share the same HIV status. In the RZHRG model, HIV test results are shared with the partners together, and counselors work with them to develop a plan to help them address the impact of HIV/AIDS in their lives.