When should someone seek medical attention for influenza symptoms?

This fact sheet will look at zoonotic influenza (human infections) caused by influenza viruses of avian origin. Since 1997, 2,723 cases of zoonotic human ... 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 ... Influenza (flu) is a very contagious viral infection that affects the air passages of the lungs. It causes a high fever, body aches, a cough, and other ... The deadliest pandemic of the 20th century. The 1918 influenza outbreak was caused by a new strain of the influenza A virus that started in birds (H1N1). After ... Oct 1, 2006 ... Colds and the flu cause many of the same symptoms. But colds are usually mild, while the flu tends to be more severe. Nov 6, 2023 ... Period flu isn't the flu or an official medical diagnosis. It's a type of premenstrual syndrome (PMS), which can cause symptoms similar to the flu. 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 ... Four themes were identified as causes of vaccine hesitancy comprising: concerns over safety, lack of trust, lack of need for vaccination and cultural reasons. Feb 4, 2025 ... Pneumonia symptoms and causes · Bacterial pneumonia. · Viral pneumonia. Various viruses can cause this type, including the influenza virus, and it ... 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 ...