New Delhi, March 27 -- Researchers are racing to get approval for new and repurposed drugs and treatments that protect against severe forms of coronavirus disease (Covid-19) with no hope for a vaccine before 2021.

Infusing the antibody-rich blood plasma of people who have recovered from Covid-19 was approved for use as a treatment for critically ill patients in the US on Wednesday.

Two New York city hospitals, Mount Sinai and Albert Einstein College of Medicine plan to start plasma - the liquid component of the blood that contains antibodies - therapy early next week, even as three protocols for clinical trials were submitted for approval to the US Food and Drug Administration.

Most recently used in China to treat Covid-19 patients, plas...