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For a number of reasons, as time goes on vaccines become less effective. So how do researchers calculate how well vaccines are working?

For a number of reasons, as time goes on vaccines become less effective. So how do researchers calculate how well vaccines are working?

Leading scientists cautioned that the level of immunity against the coronavirus among South Africa’s population due to earlier infections may be masking the severity of illness caused by the Omicron variant.

At this stage, we cannot say anything about the severity of cases with Omicron - either in primary or reinfections.

It. >> doctors say most of those hospitalized are unvbaccinated and with the virus maufrping across the country. >> you're either going to be vaccinated or recovering from covid or dead. >> as the the u.s. prepared to mark one year since the first shots went into arms, the pace of covid vaccinations is up 40% over a month ago. with nearly 460,000 people getting their first shots each day, and some 2 million total doses administered a day. about half of them booster doses. early studies suggest boosters increase protection against a new omicron variant. dr. fauci telling cnn the national instit...