THE race to develop vaccines against covid-19 got off to a flyer , but with dangerous new virus variants, stark inequalities in access to vaccines and few vaccination options for children, the world still needs all hands on deck. Last week, a virtual meeting run by the New York Academy of Sciences called The Quest for a COVID-19 Vaccine showcased the most promising new candidates.

Codagenix: A nasal spray

So far, all approved covid-19 vaccines have been injectable. Another option is a nasal spray, says Robert Coleman, CEO of biotech company Codagenix , in Farmingdale, New York.

“A …