There appears to be a genetic component in certain populations. https://asia.nikkei.com/Spotlight/Coronavirus/Genetic-factor-may-soften-COVID-blow-for-Japanese

There appears to be a genetic component in certain populations. https://asia.nikkei.com/Spotlight/Coronavirus/Genetic-factor-may-soften-COVID-blow-for-Japanese-study https://asia.nikkei.com/Spotlight/Coronavirus/Genetic-factor... Also, underreporting and asymptomatic rates are much higher than initially assumed.