The world is still in the middle of the first wave of the coronavirus outbreak, WHO emergencies head Dr Mike Ryan told an online briefing, noting that while cases are declining in many countries they are still increasing in Central and South America, South Asia and Africa.
Ryan said epidemics often come in waves, which means that the novel coronavirus could come back later this year in places where the first wave has subsided.
There was also a chance that infection rates could rise again more quickly if measures to halt the first wave were lifted too soon, he added.
“When we speak about a second wave classically, what we often mean is there will be a first wave of the disease by itself, and then it recurs months later. And that may be a reality for many countries in a number of months’ time,” Ryan said.
“But we need also to be cognisant of the fact that the disease can jump up at any time.
"We cannot make assumptions that just because the disease is on its way down now, it is going to keep going down. We may get a second peak in this wave," he added.
He said countries in Europe and North America should “continue to put in place the public health and social measures, the surveillance measures, the testing measures and a comprehensive strategy to ensure that we continue on a downwards trajectory and we don’t have an immediate second peak”.
Many European countries and US states have taken steps in recent weeks to lift lockdown measures that curbed the spread of the disease but caused severe harm to economies.
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