Flu (Influenza)- symptoms, causes, treatment, complications. Flu vaccine
Influenza is a serious viral respiratory infection with the highest death rate. Influenza epidemiology covers seasonality (winter months of the year), worldwide prevalence, and virus type. Changes in the antigens of the individual strains of the virus are observed every year. The incidence of influenza only gives short-term immunity – up to several months, and only against the…