Coronavirus: Japan’s mysteriously low virus death rate

“When we looked at the tests we were astonished… in all patients the IGG response came quickly, and the IGM response was later and weak. It looked like they had been previously exposed to a very similar virus.” He thinks it is possible a Sars-like virus has circulated in the region before, which may account for the low death rate, not just in Japan, but in much of China, South Korea, Taiwan, Hong Kong and South East Asia.

Yahoo News Coronavirus: Japan’s mysteriously low virus death rate