USA: COVID shots still work but researchers hunt new improvements
(AP) --- 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.
Already there’s public confusion about who should get a second booster now and who can wait. There’s also debate about whether pretty much everyone might need an extra dose in the fall.