How often is the influenza vaccine updated?

What Causes Influenza? The root cause of the illness is infection from one of the influenza A, B or C viruses. These viruses infect the nose, throat, and ... Signs & Symptoms of the Flu · Fever or feeling feverish/chills · Cough · Sore throat · Sneezing · Runny or stuffy nose · Muscle or body aches · Headache ... ... Flu is a contagious viral infection of the nose and throat but is much more serious than the common cold. In mild cases, flu causes high fever, head and ... What Is Avian Influenza? Avian influenza, or “bird flu,” is a respiratory disease of birds caused by influenza A viruses. Wild birds, such as ducks, gulls, ... Influenza is a communicable viral disease that affects the upper and lower respiratory tract. A wide spectrum of influenza viruses causes it. What about a new, non-influenza virus, like the one that causes SARS? Would the world be able to cope with another flu pandemic? Yes, says Robert Webster ... The Flu. Similarly, the influenza virus leads to head congestion by infecting your nose, throat and lungs, and causing nasal swelling. People often confuse a ... Aug 13, 2024 ... Flu is a contagious respiratory illness caused by influenza viruses · Flu can cause mild to severe illness · Most experts believe that flu viruses ... Oct 15, 2017 ... The flu is caused by the influenza virus and lasts about 5-7 days. Symptoms of seasonal flu typically include fever, fatigue, headache, and muscle aches. Bird flu, or avian flu, is an infectious type of influenza that spreads among birds. ... But there are 4 strains that have caused concern in recent years: H5N1 ...