GPT and sexually transmitted disease: Other costs including training of healthcare professionals (pre-PrEP workshop about ELISA, HBV, HCV, alanine aminotransferase, creatinine, and prevention kits (which include information, condoms and lubricant)), HIV ELISA tests, HIV Plasma viral load measurements, and diagnosis of STI (Chlamydia and gonococcal infections, HBV, HCV, syphilis) were estimated at €1142 per person per year.