https://www.yahoo.com/news/countries-worried-covid-19-vaccines-134204342.html
Health authorities are beginning to explore plans for third doses of coronavirus vaccines - raising the prospect that two doses may not be enough.
There are several plausible explanations beyond immunity waning, Professor Eyal Leshem, an infectious disease specialist at Israel's Sheba Medical center, told Insider
Yes, the possibilities are endless.
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