Public Health England (PHE) published real-world analyses of people in the U.K. who had received the first shot of the Pfizer-BioNTech Covid-19 vaccine, with the data – which were published in The Lancet – showing that there was a decrease of about 70 percent in infections among healthcare workers after the first shot.

Deaths from Covid-19 in the United States fell for a third straight week during the week ended Feb. 21, as cases and hospitalizations showed steep drops.

The United States on Feb. 22 crossed the staggering milestone of 500,000 Covid-19 deaths just over a year since the coronavirus pandemic claimed its first known victim in Santa Clara County, California.

The risk of illness from Covid-19 dropped 95.8% among people who received both shots of Pfizer’s vaccine, Israel’s Health Ministry said on Feb. 20.

The two Covid-19 vaccines approved for use in the United States have reassuring safety profiles, the U.S. Centers for Disease Control and Prevention said on Feb. 19 after monitoring the first month of vaccinations between December 2020 and January 2021.

The United States reported a 23% drop in new cases of Covid-19 and a 16% fall in the number of people hospitalized with the virus for the week ended Feb. 14, with both figures declining for a fifth week in a row.

New York Governor Andrew Cuomo acknowledged on Feb. 15 that his office should not have withheld data on Covid-19 nursing home deaths from state lawmakers, the public and press.

The World Health Organization listed AstraZeneca’s Covid-19 vaccine for emergency use, widening access in the developing world, while sources said the EU is in talks with Moderna on buying more vaccines.

Roche’s arthritis drug tocilizumab cuts the risk of death among patients hospitalized with severe Covid-19, also shortening the time to recovery and reducing the need for mechanical ventilation, results of a large trial showed.

All the Covid-causing virus circulating in the world could easily fit inside a single cola can, according to a calculation by a British mathematician whose sum exposes just how much devastation is caused by minuscule viral particles.