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July 19, 2021 A vial of Pfizer-BioNTech vaccine being used at Gleneagles hospital in Singapore. Reuters Health authorities paused vaccine roll-outs and told younger people to avoid certain jabs over extremely rare side effects. Experts warned of soaring Covid-19 cases in even highly vaccinated countries such as Britain and Israel. Studies sounded the alarm about the jabs being less effective against virus variants, and vaccine makers raised the need for boosters to ensure people remained protected. A year ago, many experts thought the arrival of a Covid-19 vaccine could take years – if it happened at all. As recently as August, World Health Organization (WHO) director general Tedros Adhanom Ghebreyesus warned the pandemic “silver bullet” of a vaccine might never come.

United kingdomUnited statesHong kongUniversity of hong kongHong kong generalNew south walesNational university of singaporeSingapore generalAustralian capital territorySiddharth sridharTauel harperTedros adhanom ghebreyesusPeter collignonOwen schaeferWorld health organizationCentre for biomedical ethics