On a quarterly basis, the LINKAGES project releases a research digest comprised of the latest peer-reviewed article abstracts related to HIV and key populations (KPs) – sex workers, men who have sex with men (MSM), transgender people, and people who inject drugs. LINKAGES is PEPFAR and USAID’s largest global project dedicated to using evidence-based approaches for reducing HIV transmission among KPs and improving their enrollment and retention in care. KPs have the highest risk of contracting HIV and often face formidable barriers to accessing prevention, care, and treatment services. The research digest keeps implementers and researchers up to date on the rapidly expanding evidence base pertaining to HIV services for KPs on a global scale. So, what did we learn about young KPs and HIV in the past quarter?