World Health Organization chief Tedros Adhanom Ghebreyesus warns there may never be an effective vaccine for Covid-19. Speaking in Geneva, Tedros explains the need for caution despite progress developing some vaccines. ‘A number of vaccines are now in phase three clinical trials and we all hope to have a number of effective vaccines that can help prevent people from infection’ he says. ‘However, there’s no silver bullet at the moment and there might never be’
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