Can someone be contagious before showing symptoms of influenza?

Feb 12, 2018 ... We all know the symptoms of influenza infection include fever, cough, sore throat, muscle aches, headaches and fatigue. But just what causes all the havoc? What are the different types of influenza? Influenza viruses are divided into three types designated as A, B, and C. ... Influenza viruses continually mutate or ... Oct 2, 2017 ... The flu is a highly contagious disease caused by the influenza virus. The virus enters your body through your nose, eyes or mouth. Aug 19, 2008 ... Most victims succumbed to bacterial pneumonia following influenza virus infection. The pneumonia was caused when bacteria that normally inhabit the nose and ... 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 ... Influenza is a communicable viral disease that affects the upper and lower respiratory tract. A wide spectrum of influenza viruses causes it. Mar 7, 2025 ... Influenza, commonly known as the flu, is a highly contagious respiratory illness caused by influenza viruses. Its severity can vary from mild to ... Feb 12, 2025 ... Generally, influenza viruses can infect some wild species without causing signs of disease, but new strains can emerge that cause illness with ... Oct 18, 2018 ... What is keto flu? The so-called keto flu is a group of symptoms that may appear two to seven days after starting a ketogenic diet. · What causes ... Feb 28, 2024 ... The flu is caused by flu viruses that spread from person to person. When someone with the flu coughs, sneezes, or talks, they spray tiny ...