Pfizer announced Saturday that tweaking its COVID-19 vaccine to better target the Omicron variant is safe and works -- just days before regulators debate whether to offer Americans updated booster shots this fall.
Several Chinese cities have scrapped or relaxed their COVID-19 testing mandates after China emerged from its worst regional outbreaks, with officials told not to cause too much disruption to people's lives while staying vigilant about the virus.
Nearly 20 million lives were saved by COVID-19 vaccines during their first year, but even more deaths could have been prevented if international targets for the shots had been reached, researchers reported Thursday.
Omicron subvariants BA.4 and BA.5 appear to escape antibody responses among both people who had previous COVID-19 infection and those who have been fully vaccinated and boosted, according to new data from researchers at Beth Israel Deaconess Medical Center, of Harvard Medical School.
Leaders of the global scheme aiming to get COVID-19 vaccines to the world's poorest are pushing manufacturers, including Pfizer and Moderna, to cut or slow deliveries of about half a billion shots so doses are not wasted.
Although experts expect relaxing Canada's travel rules will be a boon for the domestic tourism sector, they note the continued requirements for unvaccinated Canadians crossing the border could limit their ability to roam abroad as they still have to quarantine for 14 days upon return.