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Licensed practical nurse Yokasta Castro, of Warwick, R.I., draws a Moderna COVID-19 vaccine into a syringe at a mass vaccination clinic, Wednesday, May 19, 2021, at Gillette Stadium, in Foxborough, Mass. U.S. regulators have opened up COVID-19 booster shots to all and more adults, Friday, Nov. 19, letting them choose another dose of either the Pfizer or Moderna vaccine. (AP)

US opens COVID boosters to all adults, urges them for 50+

Under the new rules, anyone 18 or older can choose either a Pfizer or Moderna booster six months after their last dose

20 Nov 2021 3:32 PM IST

Employees pack boxes containing vials of Covishield, a version of the AstraZeneca vaccine, at the Serum Institute of India in Pune. (Photo: AP)

Trigger of rare blood clots linked with AstraZeneca Covid vaccine...

Researchers worked with AstraZeneca to analyse whether the ultra-rare side effect could be linked to the viral vector

2 Dec 2021 3:59 PM IST

A Tokyo Metropolitan Government employee takes the Modernas COVID-19 vaccine shot at a newly opened vaccination center in the government building in Tokyo. (Photo: AP)

Will one dose of a two-dose COVID-19 vaccine protect me?

There's a concern the shots eventually might lose their effectiveness if variants evolve enough

2 July 2021 1:02 PM IST

In this March 26, 2021, file photo, a member of the Philadelphia Fire Department prepares a dose of the Johnson & Johnson COVID-19 vaccine at a vaccination site setup at a Salvation Army location in Philadelphia. (Photo: AP)

Johnson & Johnson's single-dose vaccine shows promising signs against...

According to the company report, the vaccine generated strong, persistent activity against the Delta variant

2 July 2021 9:17 AM IST