Coronavirus: What is a second wave and is one coming?

Some countries are still dealing with large epidemics, but even those currently controlling the virus fear “the second wave”.The number of infections goes up and then comes back down again – each cycle is one “wave” of coronavirus.”It’s not particularly scientific, how you define a wave is arbitrary,” Dr Mike Tildesley, from the University of Warwick, told the BBC. To say one wave has ended, the virus would have been brought under control and cases fallen substantially.New Zealand, which has its first cases after 24 days without coronavirus, and Beijing which is facing an outbreak after 50 virus-free days are not in this position.The answer lies almost entirely with the decisions we make so it could go either way.”The evidence is the vast majority of people are still susceptible, in essence if we lift all measures we’re back to where we were in February,” says Dr Adam Kucharski from the London School of Hygiene and Tropical Medicine.

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