How come? Had flu shot in October & got flu in January; what's going on?

The flu shot does not ever cover ALL strains of flu.

You must have one that was not covered.

vaccines arent 100% effective. my brother was vaccinated for chicken pox but got them later on. the vaccine doesnt work in all cases. there are multiply strains of the flu sometimes stuff like this happens

YOU GOT A DIFFERENT BUG THAN WHAT YOU GOT IMMUNIZED WITH!

There is a new strain of flu from Australia that wasn't included in this years flu vaccine. You may have gotten that strain.

dont no but my mum and dad had the flu injection and they both caught it aswell i dont understand it whats the point in them getting the shot in the first place

no vaccine is 100% effective, plus when talking about the flu vaccine those at the most risk for problems with the flu (chronically ill, infants, elderly, etc) are also the ones for whom the vaccine is the least effective, which is why people with less risk need to be vaccinated to lower the risk of others being infected.

Usually if you get the flu after being vaxed you get a milder case without any secondary infections, etc.

THE EXACT SAME THINGG HAPPENED TO MEEE!

Flu shot don't cover all the different strains out there. They just cover the ones they think will be the biggest threats of the season.

There may be several reasons for your situation.

1) The flu shot does not protect against all flu. It contains 3 strains of influenza virus that are chosen by experts as most likely to cause a flu outbreak. These strains are chosen >6 months in advance. It is important to understand that there are literally thousands of known strains of influenza virus, and infection by any one can cause the flu.

2) No vaccine is perfect. Even if it contained the correct strains, your body may not have mounted a strong enough response to the vaccine in October to fight off the infection in January. Estimates of vaccine effectiveness generally range between 50-80%.

3) Your illness in January may not have been the flu. Most people mistake symptoms of the common cold for the flu. Colds are usually caused by different viruses than the influenza virus. These include coronavirus, rhinovirus, adenovirus, etc. While similar to a cold, the flu often causes severe muscle aches, headaches, and high fevers.