Risk assessment is highly subjective. We are programmed to be careful, so we are seeing through a magnifying glass when look at the possibility of getting a reported side effect.
RISK TABLE
Very common - 1 in 10 - 1 in a family
Common - from 1 in 10 to 1 in 100 - 1 in a street
Uncommon - from 1 in 100 1 in 1000 - 1 in a village
Rare - from 1 in 1000 to 1 in 10,000 - 1 in a small town
Very rare - Less than 1 in 10,000 - 1 in a large town
Add to that the fact that for one person who tells all the friends and acquaintances about a given side effect, there could be 99 people who didn't get it so didn't mention it. You hear more about problems than than about those that go smoothly.
Reported side effects of flu jabs - Soreness, redness or swelling at the injection site, low-grade fever, and aches. after a flu jab - 1 to 2 in a 100
Extreme reactions - about 2 in a million (100,000)
Annual attack rate of influenza - estimated at 5%–10% in adults and 20%–30% in children. Worldwide, these annual epidemics are estimated to result in about 3 to 5 million cases of severe illness, and about 250 000 to 500 000 deaths.
Possible complications of influenza - They include viral or bacterial pneumonia, dehydration, and ear infections and sinus infections, especially in children. The flu can worsen long-term medical conditions, like congestive heart failure, asthma, or diabetes. You might also have muscle inflammation (myositis), problems with your central nervous system, and heart problems such as heart attacks, inflammation of the organ (myocarditis), and inflammation of the sac around it (pericarditis).