Moderna

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Moderna Inc. has released a set of data which suggested its COVID-19 vaccine is effective in preventing serious health issues or death from "variants of concern" but admitting that efficacy decreases over time, such that those who received the vaccine last year were twice more likely to contract a case of the coronavirus disease

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Is there a booster coming?

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Is there a booster coming?

Why would you need a booster if the vaccine is so effective ?

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Why would you need a booster if the vaccine is so effective ?

Because the virus mutates. The vaccine will still have the same effectiveness against the same virus, however once the virus mutates enough, it is no longer what you've been vaccinated for. People who get the original vaccine, but who do not get a booster, will still have the same amount of immunity from the original virus, but not to the mutated virus.

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Because the virus mutates. The vaccine will still have the same effectiveness against the same virus, however once the virus mutates enough, it is no longer what you've been vaccinated for. People who get the original vaccine, but who do not get a booster, will still have the same amount of immunity from the original virus, but not to the mutated virus.

Thanks for the explanation.

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Every vaccine to date needs a booster shot as it looses effectiveness over the years. Some need boosters more often than others.