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Reality check: Why 15K new cases of COVID-19 doesn’t mean the outbreak is exploding

Reality check: Why 15K new cases of COVID-19 doesn’t mean the outbreak is exploding
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On Wednesday evening, China announced its new numbers on cases of COVID-19 , the novel coronavirus disease that has stricken the country.

It said it had 15,152 new cases and 254 new deaths — the biggest single-day increase yet.

But these numbers don’t mean the outbreak is spreading uncontrollably, experts say. Rather, it’s more a change to how cases are counted that has inflated the total.

“This increase that you’ve all seen in the last 24 hours is largely in part down to a change in how cases are being diagnosed and reported,” said Dr. Michael Ryan, executive director of the World Health Organization’s health emergencies program, at a press conference Thursday morning.

While 15,000 new cases is a big increase, Ryan said, not all these cases necessarily happened in a single day.

“Most of these cases relate to a period going back over days and weeks and are retrospectively reported as cases since, sometimes, back to the beginning of the outbreak,” he said.

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Cases in Hubei province, which has seen the vast majority of COVID-19 cases so far, will now be counted on the basis of a clinical diagnosis, not only when they have been confirmed in a laboratory.

That means that doctors could diagnose a patient with COVID-19 after seeing signs of lung infection on a CT scan, rather than sending a sample off to a lab to see whether the person has the virus. This is less accurate, as it could include other kinds of pneumonia, but it is much faster, experts say.

Other Chinese provinces, aside from Hubei, will still be reporting only lab-confirmed cases of COVID-19.

“The reason the Chinese health authorities decided to change the diagnostic procedure by including the clinical diagnosis, I assume, is because they lack diagnostic kits, delaying treatment of those with symptoms,” said Choi Jae-Wook, chairman of the scientific review committee of the Korea Medical Association.
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