Sir: The death toll rises due to Congo virus that hits Karachi City. The number of Congo fever has now reached to 10 in the current year. The recent four of the deaths occurred in the first two weeks of August 2019 due to the increased interaction between humans and sacrificial animals on the occasion of Eidul Azha. The doctors have declared the deaths the reason of Congo Crimean Hemorrhagic Fever CCHF. According to the experts CCHF is a lethal viral infection that is transmitted to humans from animals. And the virus injects itself to the body and can finish the victim within a small period of hours and days. The health authorities should concern to this rheumatic fever which is causing numbers of fatalities. The officials should establish a surveillance system and isolation wards to all tertiary hospitals and districts so that the people get awareness for the personal equipment to combat to it and the isolation wards will immobilize it to further extension. ASIF MURAD UMRANI Karachi