AstraZeneca Booster Shot Needed to Shore Up Protection, Study Finds
- Protection against severe Covid diminishes after 3 months
- Research doesn’t include Astra’s shot against omicron strain
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Protection from severe illness following two shots of AstraZeneca Plc’s Covid-19 vaccine starts declining about three months after the second dose, according to a study that reinforces the need for boosters.
The researchers analyzed data for 2 million people in Scotland and 42 million people in Brazil and assessed the risk of severe Covid outcomes, including hospitalizations and deaths, three months after the second dose. They didn’t analyze Astra’s shot against the fast-spreading omicron variant, which wasn’t circulating at the time.