These mucosal vaccines target thin mucous membranes that line the nose, mouth and lungs. By prompting immune responses where SARS-CoV-2 first enters the body, mucosal vaccines could, in theory, prevent even mild cases of illness and block transmission to other people — something COVID-19 shots have been unable to do. Vaccines that produce sterilizing immunity would be game changing for the pandemic. ...
China still requires those arriving from abroad be quarantined at a hotel or private home and proof of a negative test is required for entry to many public and commercial spaces.
The researchers used data from 185 countries to estimate that vaccines prevented 4.2 million COVID-19 deaths in India, 1.9 million in the United States, 1 million in Brazil, 631,000 in France and 507,000 in the United Kingdom.
/cloudfront-us-east-2.images.arcpublishing.com/reuters/PLDERIN64NPCBKCYJDOJ3VDBNA.jpg)
/cloudfront-us-east-2.images.arcpublishing.com/reuters/OJHNCLX3RRLCDE23A6GFBW3OFQ.jpg)
