Regarding the profile of individuals who obtained a non-reactive result in the ELISA test, the majority were male (57.8%), aged between 25 and 50 years (68.4%), self-declared as brown (63.2%), with less than 5 years since HIV diagnosis (47.4%), had an average of 401 CD4+ T lymphocytes (SD = 320), and were vaccinated against COVID-19 (68.4%). Here, CD4 is linked to COVID-19.