What is avian influenza?

The 1918 influenza pandemic was the most severe pandemic in recent history. It was caused by an H1N1 virus with genes of avian origin. Avian influenza (H5N1 HPAI), also known as "bird flu," is a highly infectious, systemic disease of poultry caused by an Orthomyxovirus of the genus ... ... Flu is a contagious viral infection of the nose and throat but is much more serious than the common cold. In mild cases, flu causes high fever, head and ... 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 ... 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. What is the flu? · How does the flu spread? · Does your child need a flu vaccine every year? · Are some children more likely to have serious health problems caused ... Aug 10, 2023 ... A life-threatening blood clotting disorder can be caused by an infection with adenovirus, one of the most common respiratory viruses in pediatric and adult ... Influenza (flu) is a highly contagious viral infection of the respiratory tract that can cause severe illness and life-threatening complications (including ... What Causes Influenza? Influenza is caused by several different viruses that are in the influenza family. Each year, flu season is defined by a few ... A headache is a pounding feeling in your head or neck that is triggered by pain-sensitive nerves. What are the symptoms of a cold and flu headache? What causes ...