The study, published in the journal Nature, says most people vaccinated with mRNA vaccines may not need booster shots if the virus & its variants don't evolve much beyond their current forms.
A mixed schedule of the Pfizer shot followed by Astra vaccine, and vice versa, resulted in high concentrations of antibodies against Covid when given 4 weeks apart, researchers said.
The study finds Pfizer's Covid vaccine offers 79 per cent protection and the AstraZeneca vaccine, known as Covishield in India, secures 60 per cent protection against Covid strain.
This is the largest purchase & donation of vaccines by a single country and a commitment by the Americans to help protect people around the world from Covid, the White House said.
A group of advisers to Centers for Disease Control and Prevention will meet Wednesday to make recommendations for administering the vaccine. Kids could begin receiving them Thursday.
As many as 41 cases were reported to have tested positive for the Indian variant in Israel. Five children were among the 41, of which four had been fully vaccinated.
India should have secured greater savings by pressing Russia for prices nearer the cap while sustaining high volumes. This would have preserved strategic autonomy and served economic logic.
One such website has drawn particular scrutiny for spreading fake stories that have upset not only the Indian but also foreign defence firms by falsely attributing misinformation.
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