KGO ABC World News Tonight With David Muir November 23, 2021 23:40:00
But tonight, there is more promising data on the vaccine in adolescents. pfizer reporting its shots were safe and 100% effective at preventing covid in 12 to 15-year-olds for at least four months. new covid cases are ticking up across 32 states, with overall infections up 42% in the last four weeks. >> we're dealing with a much more contagious variant than we did before. >> reporter: overwhelmed hospitals in michigan reportedly asking the pentagon for emergency staff. and in minnesota, the national guard is now training teams to help ease nursing shortages. and david, michigan hospital officia...