What are the limitations of using symptomatic surveillance data for influenza?

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 ... What Is Avian Influenza? Avian influenza, or “bird flu,” is a respiratory disease of birds caused by influenza A viruses. Wild birds, such as ducks, gulls, ... Jan 14, 2025 ... It's a very rare event, but we know that reassortment has resulted in the influenza viruses that have caused the last three human pandemics. Avian influenza (AI) is caused by influenza type A viruses that historically have spread between wild birds (waterfowl and shorebirds) with occasional ... Jul 8, 2019 ... Equine influenza is a highly contagious respiratory disease of horses caused by subtypes of the influenza A virus. Dec 18, 2017 ... ... flu-related causes expire because the virus overwhelms the immune system; another third die from the immune response to secondary bacterial ... Influenza (or “flu”) is a respiratory infection caused by influenza virus. Influenza outbreaks happen every year, usually between November and April. 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 ... Jan 28, 2025 ... Symptoms of the flu such as a sore throat and a runny or stuffy nose are common. You may also get these symptoms with other illness such as a ... Bacteria. Bacterial pneumonia can occur on its own or develop after you've had a virus like the cold, flu, COVID-19 or RSV.