In the summer of June 2011, the first case of Crimean-Congo hemorrhagic fever (CCHF) was observed in Oman since the last fifteen years. The first blood sample using reverse transcriptase polymerase chain reaction (PCR) test were sent looking for CCHF, tick-borne encephalitis, dengue, Japanese encephalitis, Chikungunya and West Nile. All resulted as negative. The repeated serology for CCHF came strongly positive after five days from the initial negative test, and accordingly patient started on ribavirin and he responded to it. His condition improved dramatically.