ZVIMBA, Zimbabwe (AP) — For Pelagia Bvukura, who lives in a rural part of north-central Zimbabwe, COVID-19 had always been a “city disease,” affecting those in the capital, Harare, or other, distant big towns.
A majority of U.S. adults are concerned about the delta coronavirus variant but have not significantly changed their behavior because of it, according to the Axios-Ipsos Coronavirus Index.
MOSCOW (Reuters) -Russia’s Sputnik V vaccine against COVID-19 is around 90% effective against the highly contagious Delta variant of coronavirus, its developers said on Tuesday.
Three scientific studies released on Monday offered fresh evidence that widely used vaccines will continue to protect people against the coronavirus for long periods, possibly for years, and can be adapted to fortify the immune system still further if needed.
Most people immunized with the mRNA vaccines may not need boosters, one study found, so long as the virus and its variants do not evolve much beyond their current forms — which is not guaranteed. Mix-and-match vaccination shows promise, a second study found, and booster shots of one widely used vaccine, if they are required, greatly enhance immunity, according to a third report.
A mixed schedule of vaccines where a shot of Pfizer's Covid-19 vaccine is given four weeks after an AstraZeneca shot will produce better immune responses than giving another dose of AstraZeneca, an Oxford study said on Monday.
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