influenza viruses

Influenza viruses are the germs that cause the flu, a contagious respiratory illness. There are several types, with Influenza A and B being the most common in humans. These viruses can change quickly, which is why we need new vaccines each year. Symptoms often include fever, cough, sore throat, body aches, and fatigue. While many recover in a week or two, the flu can be serious, especially for vulnerable groups like the elderly or those with other health conditions. Vaccination is the best way to prevent infection and reduce the spread of the virus.