Widespread Covid-19 vaccinations not expected until mid-2021, WHO says

The World Health Organization does not expect widespread vaccinations against Covid-19 until the middle of next year, a spokeswoman said on Friday, stressing the importance of rigorous checks on their effectiveness and safety.

None of the candidate vaccines in advanced clinical trials so far has demonstrated a “clear signal” of efficacy at the level of at least 50% sought by the WHO, spokeswoman Margaret Harris said.