Flu variant that hits kids and seniors harder than other strains is dominant in U.S. right now
A sign advertising flu shots is displayed at a Walgreens pharmacy on January 22, 2018 in San Francisco, California. A strong strain of H3N2 influenza has claimed the lives of 74 Californians under the age of 65 since the flu season began in October of last year.Justin Sullivan | Getty ImagesA variant of the flu that hits kids and seniors worse than other strains of the virus is dominant in the U.S. right now, setting the country up for a potentially bad flu season.Public health labs have detected influenza A(H3N2) in 76%…