COVID shots still work but researchers hunt new improvements

  • FILE - A health worker administers a dose of COVID-19 vaccine during a vaccination clinic in Reading, Pa. COVID-19 vaccinations are at a critical juncture as companies test whether new approaches like combination shots or nasal drops can keep up with a mutating coronavirus — even though it’s not clear if any change is needed. (AP Photo/Matt Rourke, File)

COVID-19 vaccinations are at a critical juncture as companies test whether new approaches like combination shots or nasal drops can keep up with a mutating coronavirus — even though it’s not clear if changes are needed.