(CNN) — Covid-19 vaccines roughly halved the chances that a US adult would need to visit the emergency room or be hospitalized with their infections last fall and winter, according to two sources ...

The Covid-19 pandemic’s early death toll was much higher than the official US count, according to a new study that spotlights dramatic disparities in the uncounted deaths. About 840,000 Covid-19 ...

Since the first sign of an outbreak, the reminders have come from government officials, health agencies and plenty of experts ...