A Big Unknown in Covid-19 Vaccine Development: How Long Will Protection Last?

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A Big Unknown in Covid-19 Vaccine Development: How Long Will Protection Last?
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Initial trials suggest vaccines can induce antibody production. But it is too early to know how long they will work, or even whether they are protective.

If any of the most-advanced Covid-19 vaccines prove to work safely, they may protect people for months or years rather than the rest of their lives, according to emerging science and health experts.

Only a handful of vaccines generate lifetime immunity for most people, such as the ones for measles, a viral infection that naturally produces lifelong immunity. Experts caution against expectations of such longevity for Covid-19, citing experience with other respiratory viruses plus emerging data on the longevity of the antibodies...

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