Besides SINAN, other administrative databases were used by the Department of Surveillance, Prevention and Control of STIs, HIV/AIDS and Viral Hepatitis (DIAHV) to perform annual linkage using the software Reclink [11] with SIM (Mortality Information System), SISCEL (Laboratory Tests Control Systems) and SICLOM (Medication Logistics Control System), resulting in a more complete AIDS database, including information regarding CD4+-cell count, HIV viral load and ART use. The gene discussed is CD4; the disease is AIDS.