Flu shots - its a myth that they cause the flu. What happens is, the flu shots are given in autumn - around the time that your every day common cold is starting to spread around the community. The flu is NOT the same as a cold - it is a different virus. Influenza is a serious illness, with some different symptoms to a cold, and can often put people (especially old people) in hospital.
The flu shots protect against some strains of the Influenza virus, about 70% of them. They work it out based on the strains that were common in the flu season in the northen hemisphere, and in previous years. Sometimes, they guess wrong and the flu shot protects against only 50% of the strains. Better than nothing though!
The vaccine is NOT a live vaccine, it's a type called "inactivated". Basically, they take the flu virus in its capsule, and remove the flu DNA. They inject only the empty capsule into you, so there is NO influenza DNA and therefore NO chance that that flu virus can replicate in your body. Your body reacts to the capsule, and develops antibodies against that, so it can fight the real flu if it enters your system. Does that make sense?
If you get some cold symptoms after your flu shot -think about it. When after was it? Often people attribute an ordinary autumn cold to the flu jab, when in fact they got the cold up to 8 weeks after the shot! Think about it... are people at your work sick? Your family? Know anyone with a cold? Is it that unusual that you got it?
It's basically like getting the flu shot and waking up the next day with food poisoning. It wasn't the flu shot that gave it to you, it was the dodgy seafood you had on the same day...
I think I rambled a bit.. I hope that helped some people!
My final word on it - I get the flu shot every year, and I think everyone who works with young children (e.g. in daycare) or sick people (e.g. in hospitals) or old people (e.g. in nursing homes) should get one. You could get the influenza virus and still feel well enough to work, but then pass it on to someone who will get very sick from the same virus. Influenza is also pretty nasty, as I said, and people usually are sick for 1-2 weeks.
That said - its completely your own decision. Just make sure its an informed decision, and not just because the lady down the road tells you that her friends aunty got the flu after getting a flu shot - when its impossible! You should be aware that you might get a sore arm for a couple of days after the shot. If you develop symptoms of anaphylaxis (throat swelling, tongue swelling, difficulty breathing, hives, etc), get to a doctor ASAP - an extreme allergic reaction is very very very rare but can be life threatening. But you can't get the flu from the flu shot!
You might get a cold. You might get a strain of the flu virus not covered by the vaccine (very unlucky!). You might fall off a ladder and break your arm. You might be in a car accident. You might develop appendicitis. None of these are related to the flu jab!