<prompt> The most common symptom of AIDS in an infant isGastrointestinal infectionPersistent coughFailure to thriveLymphadenopathy  <response>: Clinical features in an HIV infected infant is:Recurrent GI infection and oral thrush is commonly foundClinical features in older children:Growth failureFeverDiarrheaSecondary infectionRefer: OP Ghais Textbook of Pediatrics, 8th edition, pg no. 202 