<prompt> What is the most common oppounistic infection in aids?TuberculosisCryptococcosisPneumocystitis canniiHistoplasmosis  <response>: Globally ,tuberculosis is the most common cause of moality morbidity in HIV-infected patients . When CD4 count is less than 500cellscubic millimeter ,tuberculosis may occur in an HIV patient .It is the most common cause of admission in patients with mild immune suppression . Reference: Harrison20th edition pg 877 