RESUMEN
The diagnosis of primary HIV-1 infection (PHI) is often missed and requires a high index of suspicion and a thorough knowledge of laboratory methods. We report the case of a young promiscuous male who presented with fever, rash and neurological symptoms 8 weeks after unprotected sexual exposure. Clinical and laboratory investigations showed the presence of leucopenia and thrombocytopenia with elevated transaminases, and a normal cerebrospinal fluid analysis, while CNS imaging revealed a vasculitis-like involvement of the corpus callosum. Symptoms resolved spontaneously over 3 weeks. Fourth generation ELISA with p24 antigen assay was positive with high HIV-1 RNA load while Western-Blot was negative, thus confirming the diagnosis of PHI. The patient was subsequently started on antiretroviral therapy (ART) and showed undetectable viral load after 8 weeks of therapy. We present the differential diagnoses which need to be entertained as well as the pros and cons of very early ART intervention.