CD4 and Opportunistic infection: Thus, the prevention of opportunistic infections in individuals infected with HIV, together with the investigation of suspected cases, animal protection measures, such as the use of collars impregnated with deltamethrin and laboratory monitoring (including LT-CD4 + count and HIV viral load testing) from the beginning of follow-up, in addition to the investigation of comorbidities and coinfections, constitute effective interventions [15,33,35].