How does influenza affect the respiratory system?

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 ... A 2014 Vaccine poll reported that 43% of respondents would not get the vaccine because they believed it would cause influenza, but physicians are breaking down ... Viral gastroenteritis is not harmful. However, viral gastroenteritis can become dangerous if it leads to dehydration. Bacteria. Bacterial pneumonia can occur on its own or develop after you've had a virus like the cold, flu, COVID-19 or RSV. 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 ... Jun 8, 2017 ... Antigenic drift in human flu viruses is what causes the changes in seasonal flu viruses each year and is why the seasonal flu vaccine must be ... The flu is caused by a virus. Viruses are generally passed from person to person through the air when an infected person sneezes or coughs. But the virus can ... What some people call the stomach flu is actually another virus or bacteria that causes gastrointestinal illness. Influenza is a respiratory illness that should ... Sep 14, 2023 ... Only influenza virus types A, B, and C cause the flu. Type A and B viruses cause the large seasonal outbreaks. Type C usually causes milder respiratory ... 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 ...