Coronavirus cases worldwide surpassed 200 million on Aug. 4, according to a Reuters tally, as the more-infectious Delta variant threatens areas with low vaccination rates and strains healthcare systems.

A record number of Americans died of drug overdoses during 2020 as pandemic lockdowns made getting treatment difficult and dealers laced more drugs with a powerful synthetic opioid, according to data released on July 14 and health officials.

Pfizer and partner BioNTech plan to ask U.S. and European regulators within weeks to authorize a booster dose of the companies’ Covid-19 vaccine, based on evidence of greater risk of infection six months after inoculation and the spread of the highly contagious Delta variant.

The World Health Organization said on Friday that it was not clear whether Covid-19 booster vaccines will be needed to maintain protection, until further data is collected.

The Olympics will take place without spectators in host city Tokyo, organizers said on July 8, as a resurgent coronavirus forced Japan to declare a state of emergency in the capital that will run throughout the Games.

World Health Organization emergencies head Michael Ryan urged countries on July 7 to use extreme caution when lifting Covid-19 restrictions so as “not to lose the gains you’ve made.”

New Delhi will start relaxing its strict coronavirus lockdown next week if new cases continue to drop in the city, the chief minister of India’s capital said on May 23.

Next year, people are likely to need an annual Covid-19 vaccination just like they need an annual flu shot. That prediction is made by researchers at six of Australia’s leading medical research institutions, based upon their study of the levels of neutralizing antibodies needed to confer protection against Covid-19.

India’s new coronavirus infections hit a record level on April 14 with Mumbai set to be locked down at midnight, but hundreds of thousands of pilgrims still thronged to a religious festival in the north of the country.

More young adults in the United States reported feeling anxious or depressed during the past six months of the COVID-19 pandemic, and fewer people reported getting the help they needed, according to a U.S. government study released on March 26.