In some countries a second COVID-19 booster is being administered.
That means in some places people have had four shots of the COVID-19 vaccine.
Can people with natural immunity be exempt from vaccine mandates?
Where is the fourth dose available?
The public health department in Sweden is now recommending people 80 and older should get a second COVID-19 booster. Read more about it here.
Sweden is one of the few places recommending a fourth shot beyond the initial booster.
The CDC said that the booster is effective against the virus, but loses potency after about four months.
Man causes scene on flight to share opinions on the vaccine
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