The Corona virus is not yet over as some countries are still dealing with a major outbreak of the epidemic, but even those who currently control the virus fear the "second wave".
-What is the second wave?
There is no official definition of it.
"It is not particularly scientific, how to define a wave is done arbitrarily," Dr. Mike Tildesley of the University of Warwick told BBC.
Some describe any rise as a second wave, but it is often a difficult first wave. This occurs in some US states.
To say that one wave has ended, the virus is under control and the cases are significantly reduced.
To start a second wave, you'll need a steady rise in infection. Neither New Zealand, which suffers from its first cases after 24 days without the Coronavirus, nor Beijing, which is facing an outbreak of the disease after 50 days free of the virus, is in this situation.
-What could lead to a second wave?
Significant lifting restrictions.
Closures caused great disruption around the world, resulting in job losses, affecting people's health and getting children out of school, but the virus was brought under control.
"The ultimate mystery is how to maintain this control, while minimizing daily disorder," says Dr. Kucharsky.
No one is 100 percent sure how far that can be achieved.
This is why measures are being lifted in stages and new methods are being introduced to control the Corona virus, such as tracking contacts or gags.
Otherwise, these foci contribute to a second wave.
"But if the cases increase again, we can re-enforce the closure to suppress a second wave, this is always an option available to us," says Dr. Tildesley.
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