Influenza virus: Influenza refers to illness caused by the

Influenza refers to illness caused by the influenza viruses , but the term is commonly and incorrectly used to refer to similar illnesses caused by other viral respiratory pathogens. Influenza viruses are classified as type A, B, or C by their nucleoproteins and matrix proteins. Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses . Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin one to four (typically two) days after exposure to the virus and last for about two to eight days. Influenza Virus Influenza , commonly referred to as the flu , is an infectious disease caused by the influenza virus . Despite being a familiar term, the intricacies of this virus , its symptoms, types, and treatment options are often misunderstood. Influenza ( flu ) is a contagious respiratory illness caused by influenza viruses . It can cause mild to severe illness. The virus is transmitted easily from person to person via droplets. Influenza tends to spread rapidly in seasonal epidemics. Infection usually lasts for about a week, and is characterized by sudden onset of high fever, aching muscles, headache and severe malaise, non-productive cough and sore throat. Serious outcomes of influenza infection can result in hospitalization or ...