alemam sana

May 18, 2020

It’s So Hard to Know Who’s Dying of COVID-19—and When

It can take days for each death to be recorded in official statistics. “Nowcasting” estimates the actual occurrence of deaths, and the true peak of the […]
May 18, 2020

Public statement for collaboration on COVID-19 vaccine development

On 31 December 2019, WHO was informed of a cluster of cases of pneumonia of unknown cause detected in Wuhan City, Hubei Province of China. Chinese […]
May 18, 2020

Coronavirus: What is the R number and how is it calculated?

There is a simple but crucial number at the heart of understanding the threat posed by the coronavirus. It is guiding governments around the world on […]
May 16, 2020

Coronavirus: Why some countries wear face masks and others don’t

Step outside your door without a face mask in Hong Kong, Seoul or Tokyo, and you may well get a disapproving look. In recent weeks, many […]