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Takeaways from a hearing include: senators are frustrated with Instagram for not moving more quickly to protect young users and the CEO maintains the platform does more good than harm.

In small studies in South Africa and in Germany, the results indicate a marked decrease in the ability of vaccines to neutralize this variant. But there are other findings that are encouraging.

Pfizer says a booster dose of its COVID-19 vaccine appears to offer important protection against the new omicron variant.

During the Tuesday presentation, Dr. Wilma Wooten said the county is still experiencing increased case rates, with the Delta virus variant being predominant.

The variant is bringing out the worst in some Western governments and global media outlets, says Dr. Ifeanyi Nsofor, a global health advocate in Nigeria.

Omicron has many more mutations than previous variants of concern, a fact that raises questions about how effective existing vaccines will be against the new form of the coronavirus.

A vaccine from a Canadian biotech firm Medicago has been found to be effective at preventing moderate to severe disease. It could soon become the first plant-based vaccine authorized for human use.

States that have detected the variant range from Hawaii to Massachusetts. The reports are part of a new surge in COVID-19 cases.

The number of COVID-19 patients hospitalized in San Diego County increased from 296 to 311.

As he prepares to leave his post of 12 years, Francis Collins reflects on the agency's biomedical advances, the dangers of polarizing medicine and the huge health gaps that still exist in the U.S.