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The National Institute of Infectious Diseases said in one study that coronavirus would possibly have continued to spread undetected through carriers with mild or nonexistent symptoms after the March-April outbreak declined once.
The recently published study warned that such a phenomenon would possibly have led to the resurgence of COVID-19 infections in June and beyond, when Japan began to resume its economic activities.
In the study, which ran until July 16, the institute collected coronavirus samples from some 3,700 patients and analyzed the genome sequence.
Because a virus mutates the infection, the institute deduced how COVID-19 spread by investigating how the virus has changed. Genome research revealed that the so-called European-type virus spread widely in Japan in March and beyond, but declined in late May thanks to preventive measures.
However, in mid-June, an obvious European-style variant was discovered in Tokyo, which would have emerged after more than 3 months of mutations. And a virus derived from this variant was later discovered in many other parts of Japan.
As the institute did not discover viruses in the midst of the mutation process, he highlighted the option of coronavirus spreading silently among young carriers, who tend to have few or no symptoms, and has gone unnoticed through public gyms.
In the report, the institute noted that coronavirus may simply not be contained in Tokyo and eventually spread across the country, in part because other people began doing business trips after the economy reopened.
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