90の日記： 米国の死者数WWII対日死者数に迫る / 抗体長くは残らず、証明書類や免疫獲得に暗雲

There were some 426,000 American casualties: 161,000 dead (including 111,914 in battle and 49,000 non-battle), 248,316 wounded, and 16,358 captured (not counting POWs who died).[192][193] Material losses were 188+ warships including 5 battleships, 11 aircraft carriers, 25 cruisers, 84 destroyers and destroyer escorts, and 63 submarines, plus 21,255 aircraft. This gave the USN a 2-1 exchange ratio with the IJN in terms of ships and aircraft.[194][195]
https://en.wikipedia.org/wiki/Pacific_War#Casualties

# Country, Other　Total Cases　New Cases　Total Deaths　New Deaths　Total Recovered　Active Cases　Serious, Critical　Tot Cases/1M pop　Deaths/1M pop　Total Tests　　Tests/1M pop　　Population
1 USA 　　　　　　 2,596,537　　+43,581　 128,152　　　 +512　　　　　1,081,437　　　1,386,948　　　15,816　　　　　　　7,845　　　　　　 387　　　　31,998,024 　　96,675　　　　330,986,397

https://www.worldometers.info/coronavirus/#countries

A closer look at people who tested positive for COVID-19 but never developed symptoms has found that such asymptomatic carriers have few to no detectable antibodies just weeks after infection, suggesting they may not develop lasting immunity.
https://www.cbc.ca/news/health/asymptomatic-covid-19-1.5629172