The promise of the new covid-19 vaccine is immense

The Economist Today years elapsed between the isolation of the measles virus in 1954 and the licensing of a vaccine. The world waited for 20 years between early trials of a polio vaccine and the first American licence in 1955. Marvel, then, at how the world’s scientists are on course to produce a working vaccine against -o-2, the virus that causes covid-19, within a single year.