Vaccine drive gains speed, but maskless fans fuel worries

The drive to vaccinate Americans against the coronavirus is gaining speed and newly recorded cases have fallen to their lowest level in three months, but authorities worry that raucous Super Bowl celebrations could fuel new outbreaks.

South Africa suspends AstraZeneca vaccine drive: 'More work' needed

South Africa has suspended plans to inoculate its front-line health care workers with the Oxford-AstraZeneca vaccine after a small clinical trial suggested that it isn't effective in preventing mild to moderate illness from the variant dominant in the country.