Japan’s fifth wave of Covid-19 Delta variant has virtually disappeared so dramatically that some scientists are puzzled as to why it happened. One team suggests the highly infectious Delta strain mutated into extinction on the island nation.
In mid-August, Japan experienced a peak in Covid-19 infections, recording over 23,000 new cases per day. Now the metric is just around 170, with deaths attributed to the disease mostly remaining in single digits this month.
The decline has been attributed by many to high vaccination rates, public acceptance of masks, and other factors, but some researchers say the drop was uniquely significant, compared to other nations with similar conditions.
Ituro Inoue, a geneticist at the National Institute of Genetics, believes that Japan had the good fortune of witnessing the Delta strain mostly rooting out other variants of the SARS-CoV-2 virus before then eradicating itself. He explained his team’s theory to the Japan Times newspape...
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