Influenza viruses are different from. H5n1 is one of several influenza viruses that causes a highly infectious respiratory disease in birds called avian influenza (or bird flu). Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world.
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Overview flu, also called influenza, is an infection of the nose, throat and lungs, which are part of the respiratory system. It is characterized by a sudden onset of fever, cough (usually dry),. Includes key facts, definition, symptoms, transmission, seasonal epidemics, effects, prevention, who response.
Infections in mammals, including humans, have.
Signs and symptoms of norovirus infection may start suddenly and include: Symptoms the signs and symptoms of pneumonia vary from mild to severe, depending on factors such as the type of germ causing the infection, and your age and overall health. Explore comprehensive guides on hundreds of common and rare diseases and conditions from the experts at mayo clinic. The flu is caused by a virus.
Who fact sheet on influenza: The united nations agency working to promote health, keep the world safe and serve the vulnerable.
