Covid-19 crisis Effectiveness and safety of a vaccine
There are two measures for a covid vaccine:

* Effectiveness
* Safety

Two vaccines are rated to be safe and 95% effective.

It does not mean that it is 5% unsafe.

These vaccines are considered to be 100% safe and 95% effective. It means that for 5% of the subjects, the vaccine does not provide the desired immunity.

Quite likely, it will not cause any harm either.

If a vaccine is not safe, i.e. known to have serious side effects, it will not be approved for use on people.

So, if the vaccine with 95% effectiveness is authorized for us, it is quite safe to use the vaccine.

Tan Kin Lian

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