Researchers and health experts are currently conducting trials to find out whether Covid-19 vaccination will become an annual necessity. Results are not yet conclusive, with the need for yearly coronavirus jabs potentially relying on the existence of new Covid-19 variants, but there is a general acceptance around much of the population — at least, in Brazil — that immunization against the pandemic-causing virus will become an unavoidable routine, much like the flu vaccine.
With this in mind, researchers from the federal Oswaldo Cruz Foundation in Minas Gerais are developing a technique to use the influenza virus as a vaccine...
