Source: South China Morning PostCovid-19 vaccine developers are making ever bolder assertions that the world will need yearly booster shots, or new vaccines to tackle concerning coronavirus variants, but some scientists question when, or whether, such shots will be needed.In interviews with Reuters, more than a dozen influential infectious disease and vaccine development experts said there is growing evidence that a first round of global vaccinations may offer enduring protection against the coronavirus and its most worrisome…Read More