Has Tokyo achieved herd immunity for COVID?


Shibuya Crossing in Tokyo, Japan
Credit: Hide1228/Wikipedia/Creative Commons 4.0

According to medical researchers from Japan and the US, stats suggest Tokyo, Japan, may have achieved herd immunity over the summer months. Herd immunity occurs when enough people have caught a particular virus, that it slows the virus’ spread. When that happens, the number of new infections begins to drop.

It should be noted that Japan and Tokyo did not institute a lockdown, with businesses and public transportation remaining open during the pandemic. This allowed the virus to spread more quickly between people than in regimes that instituted a lockdown.

The researchers had been testing a group of working people from 11 different Tokyo businesses for COVID since May. They noted that in May, 5.8% of their group tested positive for COVID and by the end of summer it had reached 46.8%

At around the same time 50% of their group…

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