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Modern COVID-19 vaccine lasts at least 6 months, the study shows



New research suggests that the protection provided by the Moderna vaccine against COVID-19 lasts for at least six months.

The report Tuesday in the New England Journal of Medicine repeats what Pfizer said last week about the vaccine, which works the same way.

Both reports were based on follow-up tests in dozens of people who received the shots during studies that led to the use of the vaccines. These studies were performed before troubled new variants or versions of coronavirus emerged and began to spread.

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A separate report in medical journal adds concern over the variants. Researchers measured antibodies that could block the virus in 50 people who had received Sinopharm or Sinovac vaccines developed in China. Many showed complete or partial loss of efficacy against a virus variant first discovered in South Africa.

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The vaccines still seemed to protect against a variant that was first found in the United Kingdom and is now spreading rapidly in the United States and elsewhere.

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Pfizer and Moderna have said they are working on updating their vaccines or possibly designing a booster shot if needed against variants.


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