Vaccine makers prepare for game of Covid cat and mouse

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Vaccine makers prepare for game of Covid cat and mouse

Scientists are keeping a close eye on mutations that could make the vaccines less effective

Hannah Kuchler

Vaccine makers and medicine regulators are sketching out plans in case the mutating coronavirus turns vaccine development into a game of cat and mouse. 

Just weeks after leading manufacturers secured the first regulatory approvals, mutations in the virus have forced scientists to re-test their Covid-19 vaccines and prepare to tweak their formula should the shots prove less effective. At the same time, regulators are considering how they could fast-track new approvals and whether they could use the seasonal flu jab as a model to authorise revised versions without requiring long trials. 

Scientists are hopeful that the existing crop of vaccines will still prove effective against the highly transmissible new variants identified in the UK and SA...

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