As different countries tackle spikes of coronavirus cases and lockdowns return to some places, it’s becoming clear that Covid-19 will be with us for a while.

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Many past pandemics such as the Spanish flu have had several waves of infection and first waves can be dwarfed by later ones. Could second and third waves from other pandemics give us a clue about how Covid-19’s likely to continue spreading? And what’s the difference between a ‘spike’ and ‘wave’? Scientists are keeping a close eye on lots of mutations to the virus in case it develops into a strain with the potential to trigger even bigger waves.

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