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Flu vaccines cause antibodies to develop in the body about two weeks after vaccination. These antibodies provide protection against infection with the viruses that are used to make the vaccine.

It takes 10 to 14 days following vaccination, before an immune response and protection develops. Therefore, most countries start immunisation in the early autumn. It is rare that the annual influenza epidemic season starts before mid-November, and the season commonly runs to the end of May the following year.

Life-threatening allergic reactions to flu shots are very rare. Signs of serious allergic reaction can include breathing problems, hoarseness or wheezing, hives, paleness, weakness, a fast heartbeat, or dizziness. If they do occur, it is usually within a few minutes to a few hours after receiving the shot.

It takes about two weeks after getting the flu shot for it to be fully effective. Getting vaccinated by the end of October will help to ensure you are protected before the holidays when flu activity typically ramps up. But if you get your flu shot too early, its protection may not last through the full season.

Where is the flu vaccine injected on your body? 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 preferred injection site for infants and young children is the front, outer area of the thigh.

1 Use a needle long enough to reach deep into the muscle. Infants age 6 through 11 mos: 1; 1 through 10 yrs: 11, and children and adults 11 years and older: 11. 2 With your left hand*, bunch up the muscle. 3 With your right hand*, insert the needle at a 90 angle to the skin with a quick thrust.

It takes about 2 weeks for protection to develop after vaccination. There are many flu viruses, and they are always changing. Each year a new flu vaccine is made to protect against the influenza viruses believed to be likely to cause disease in the upcoming flu season.

It takes up to two weeks to build immunity after a flu shot. You can benefit from the vaccine even if you dont get it until after the flu season starts. Its usually best for people in the United States to get the flu vaccine in September and October.