For context -
According to the CDC, mild side effects from the flu shot include soreness, redness or swelling at the injection site, low-grade fever and aches. Only about
1 percent to 2 percent of people who get a flu shot will have fever as a side effect, Schaffner said.
and:
Flu jab side-effects
The flu jab is generally well tolerated and any side-effects are usually mild and improve in a couple of days. The injected flu vaccine doesn’t contain live virus and can’t give you flu.
Common flu jab side-effects include the following:
- Headache
- Aching muscles or joints
- Fever
- Feeling generally unwell
- Sweating
- Shivering
- Fatigue
- Pain, swelling, redness, bruising or at the injection site
If we assume every symptom like this gets reported as an ADR, then even at a 'normal' 1-2%, that's 600,000-1.2million adverse events across the 60m population.
Sounds scary, but would be 'entirely normal', and to be expected.