What Your COVID Immunity May Be Like With A 4th Shot
HuffPost
How long do antibodies last with an additional dose? Should you time the shot to COVID waves or social plans? Here's what to know.
A fourth COVID-19 shot has been authorized for people over the age of 50 along with those under 50 who are immunocompromised. The authorization comes as BA.2, a subvariant of omicron, spreads across the globe and escalates in parts of the United States, sparking concerns about how long immunity lasts after a booster.
The latest evidence suggests antibody levels, which protect us from infection, wane about four months after a booster shot. T cells, the part of our immune system that protects us against severe illness, see a slight dip at the four-month mark but remain robust. This waning does not mean we’re no longer protected; real-world data shows that the vast majority of people who have received three doses are incredibly well protected from hospitalization (a 90% risk reduction) several months after their latest dose.
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