COVID live updates: Moderna officials 'firmly' believe 4th vaccine dose will be needed in fall

SAN FRANCISCO (KGO) -- As coronavirus cases improve across the Bay Area and United States, local health officials are loosening safety guidelines.

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Moderna officials 'firmly' believe 4th vaccine dose will be needed in fall
Moderna officials said Thursday that a second COVID-19 vaccine booster dose will be needed globally in the fall, given waning immunity and concerns over omicron and the potential for emerging variants. The company says it now believes a seasonal COVID-19 booster will be needed in the future, particularly for vulnerable populations