AstraZeneca released primary analysis showing that the company’s AZD1222 vaccine demonstrated 76 percent efficacy against symptomatic Covid-19, 100 percent efficacy against severe or critical disease and hospitalizations, and 85 percent efficacy against symptomatic Covid-19 in people 65 years and older.

The world should be back to normal by the end of 2022 thanks to Covid-19 vaccines, Bill Gates said in an interview for Polish newspaper Gazeta Wyborcza and television broadcaster TVN24.

AstraZeneca Plc is likely to come out with a new, modified statement about the company’s Covid-19 vaccine after a data and safety monitoring board expressed concern that the data in the drug manufacturer’s recent public statement were outdated, U.S. infectious disease expert Dr. Anthony Fauci said on March 24.

A large plant being used to manufacture Johnson & Johnson’s Covid-19 vaccine was cleared by U.S. regulators on March 23, setting the stage for the weekly U.S. supply to surge more than 20 percent.

Britain on March 22 demanded the European Union allow the delivery of Covid-19 vaccines the country has ordered as tensions over a possible export ban on EU-manufactured shots mounted and Brussels pointed an accusing finger at drugmaker AstraZeneca.

The United States administered 121,441,497 doses of COVID-19 vaccines in the country as of the morning of March 20 and distributed 156,734,555 doses, the U.S. Centers for Disease Control and Prevention said.

Scientists are exploring several possibilities that might explain at least 18 reports of extremely rare blood clots in the brain that occurred in individuals in the days and weeks after receiving the AstraZeneca COVID-19 vaccine.

Existing vaccines may protect against the Brazilian variant of the coronavirus, according to a University of Oxford study which also highlighted how a variant first found in South Africa poses the biggest headache for vaccine makers.

Pennsylvania-based Ocugen struck a deal to sell 100 million doses of a Covid-19 vaccine.

A World Health Organization (WHO) vaccine safety panel said on March 17 that it considers that the benefits of the AstraZeneca Covid-19 vaccine outweigh its risks and recommends that vaccinations continue.