Why the New BA.5 COVID Variant Is the Most Dangerous One Yet Bay Area hit by COVID variant that rapidly spreads, reinfects - CBS San Francisco Covid: Two in three patients suffering from headache as cases surge by 20% | Express.co.uk 4th COVID-19 vaccine effectively protects elderly against Omicron -study - The Jerusalem Post Risk of ICU 'Dramatically Higher' for Those Without COVID-19 Booster