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Which is better, passive or active immunity?

It’s not a case of better or worse per se, as each is useful. For example, when a patient urgently needs help fighting an infection, passive immunity acquired through the transfer of antibodies can provide critical support.

In terms of longevity, though, active immunity affords better protection as the antibodies acquired in passive immunity only last as long as they are in circulation, which might be weeks or months.

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