Fact: The injected flu vaccine contains an inactivated virus that cannot give you influenza. If you feel achy or slightly feverish, it is a normal reaction of the immune system to the vaccine, and …

Sep 18, 2025 · Both FluMist nasal flu vaccine and the flu shot offer good protection against influenza when vaccines are well-matched to the year’s circulating virus.

Feb 28, 2025 · Overview Seasonal influenza (the flu) is an acute respiratory infection caused by influenza viruses. It is common in all parts of the world. Most people recover without treatment. …

Processes Why influenza vaccine viruses need to be updated? Influenza vaccination is currently the principal means of reducing or counteracting influenza mortality and morbidity burden in …

Oct 21, 2018 · The influenza vaccine is the best tool we have for preventing influenza and reducing the risk of serious complications and even death. The effectiveness of the vaccine …

Oct 17, 2025 · Flu vaccination typically reduces the risk of flu illness by between 40% and 60% during seasons when the flu viruses are well-matched to the flu vaccine. But if you are infected …

Nov 7, 2024 · Common side effects of the flu vaccine include soreness at site of vaccination, headache, fever, nausea, and muscle aches. The flu vaccine protects against three or four …

Sep 29, 2025 · Influenza virus nasal vaccine side effects Get emergency medical help if you have signs of an allergic reaction: hives, difficult breathing, swelling of your face, lips, tongue, or …

Sep 18, 2025 · The flu shot is usually given as an intramuscular (IM) needle injection into the upper, outer arm muscle called the deltoid muscle in people 3 years of age and older. The …

Feb 28, 2025 · Antigenic and genetic characteristics of zoonotic influenza A viruses and development of candidate vaccine viruses for pandemic preparedness in the 2025-2026 …