How do influenza viruses evolve over time?

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 ... Influenza C virus infections generally cause mild illness and are not thought to cause human epidemics. Influenza D viruses mainly affect cows. They are not ... 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. Jan 14, 2025 ... Bird flu, also known as avian influenza A (H5N1) or highly pathogenic avian influenza (HPAI), is caused by a virus that can cause serious illness and death in ... 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 ... Sep 17, 2024 ... Influenza (flu) is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. View All · For Everyone. The flu is an infection of the nose, throat, and lungs. It spreads easily from person to person. This article discusses influenza types A and B. The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin. Influenza (Flu). •A common contagious viral infection that attacks the ... causes the flu. “It's true that some people may have a mild reaction, like a ... Sep 19, 2024 ... In infants, RSV can cause pneumonia or bronchiolitis, and people over the age of 50 or those with heart or lung disease are also at risk for ...