Pfizer Inc's experimental antiviral pill to treat Covid-19 was shown to cut by 89% the chances of hospitalization or death for adults at risk of developing severe disease, the company said on Friday, offering what could be a promising new weapon in the fight against the pandemic.

Pakistan has made an agreement to procure 13 million doses of Covid-19 vaccine from Pfizer, the country's health minister said on Tuesday.

Pfizer and the Indian government are at loggerheads over a demand by the US drugmaker for legal protection from any claims linked to the use of its Covid-19 vaccine in one of the world's biggest markets, two sources told Reuters.

A Spanish study on mixing Covid-19 vaccines has found that giving a dose of Pfizer's drug to people who already received a first shot of AstraZeneca vaccine is highly safe and effective, preliminary results showed on Tuesday.

Pfizer is seeking British approval for the use of its Covid-19 vaccine among 12- to 15-year olds and has submitted data to the health regulator, a company representative said on Tuesday, paving the way for inoculation of adolescents in the country.

Pfizer Inc on Tuesday raised its forecast for 2021 Covid-19 vaccine sales by more than 70% to $26 billion and said demand from governments around the world trying to halt the pandemic could contribute to its growth for years to come.

One dose of Pfizer Covid-19 vaccine offers an immune response similar to that generated by infection and could also offer protection from variants to people who have previously had the virus, a British study said on Friday.

North Korea has attempted to steal Covid-19 vaccine technology by hacking Pfizer Inc according to South Korea's National Intelligence Service (NIS), Yonhap news agency reported on Tuesday.

Malaysia said on Saturday it has secured coronavirus vaccine from AstraZeneca PLC, on the heels of news it will receive the Pfizer-BioNTech vaccine in February as it grapples with a surge in infections.

Pfizer Inc and partners have delivered the first Covid-19 vaccines to 141 of 145 locations targeted by the US government for the first day of a nationwide rollout on Monday ...

The first Covid-19 vaccines landed on Canadian soil on Sunday, Prime Minister Justin Trudeau said, and some Canadians are expected to roll up their sleeves for a shot as soon as Monday.

The United States said it authorized the use of Pfizer Inc's Covid-19 vaccine on Friday, with the first inoculations expected within days, marking a turning point in a country where the pandemic has killed more than 295,000 people.