Scientists have warned of the danger of simultaneous infection with seasonal influenza and coronavirus. First of all, dual disease can threaten people with weakened immunity. The fact that our usual flu affects the upper respiratory tract, and coronavirus – lower. It makes it difficult to test for a new type of infection. Diagnostic systems may not detect the virus in the patient’s body if the flu is in its active phase. A case like this has already been recorded in China. Infections advise testing patients for both types of virus by all available means. This will allow you to start the correct treatment as early as possible.