The World Health Organization’s chief scientist warned that even as numerous countries start rolling out vaccination programs to stop COVID-19, herd immunity is highly unlikely this year. At a media briefing on Monday, Dr. Soumya Swaminathan said i...

The World Health Organization warned on Saturday that recovering from coronavirus may not protect people from reinfection as the death toll from the pandemic approached 200,000 around the globe. Governments across the world are struggling to lim...