[caption id="attachment_10497" align="alignnone" width="972"] Officers wearing protective face masks warn visitors on wearing protective masks, amid the Covid-19 outbreak in Badung, Bali Province, Indonesia September...

[caption id="attachment_10515" align="alignnone" width="971"] Medical residents and doctors attend a 24-hour strike amid the Covid-19 pandemic in Seoul, South Korea, August 14, 2020. Thousands of...

[caption id="attachment_10521" align="alignnone" width="971"] A teacher wearing a protective mask welcomes a pupil on the first day of school after the summer holidays, at Colegio...

Health officials have been concerned about whether experimental vaccines could safely protect the elderly, whose immune systems usually react less robustly to vaccines, against the...

[caption id="attachment_10442" align="alignnone" width="962"] Medical workers collect samples from a man at a makeshift testing site for Covid-19 infections at the Queen Elizabeth Stadium in...