Sep 26, 2025 · Seasonal flu vaccines in the United States are formulated to protect against three influenza viruses known to cause human epidemics, including: one influenza A (H1N1) virus, one …

Dec 23, 2025 · For most people, flu stages evolve across five to seven days after symptoms appear. Here is a day-by-day guide to the flu and tips to boost your recovery.

Jan 23, 2025 · Learn more about the symptoms, causes and types of flu in this detailed article. Get quick tips on measures of prevention and more.

Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, …

Feb 28, 2025 · There are 4 types of influenza viruses, types A, B, C and D. Influenza A and B viruses circulate and cause seasonal epidemics of disease. Influenza A viruses are further classified into …

Sep 26, 2023 · There are three types of flu viruses that affect people. They’re known as influenza viruses A, B and C. Influenza A and influenza B viruses are the heavy hitters. They’re the ones that …

4 days ago · This year, all flu vaccines approved for children are designed to protect against three strains of the virus, including two influenza A strains and one influenza B strain. During any flu …

Oct 27, 2025 · There are different strains (or subtypes) of influenza type A viruses, two of which circulate among humans: H1N1 and H3N2. These two subtypes are included in the seasonal flu vaccine each …

There are 3 types of influenza virus: There are many different strains within types A and B influenza viruses but all cause similar illness. Different strains cause the regular seasonal outbreaks of flu. …

Flu is a contagious respiratory illness that infect the nose, throat, and sometimes the lungs. Learn about the current flu season and find resources related to flu surveillance and past seasons. Learn more …