Most of them are 60 or older and often have underlying health problems.In the United States, which has experienced more COVID-19 cases and deaths than any other country, the Delta variant represents about 83 per cent of new infections....
But the fact that nearly all Americans hospitalized with COVID-19 right now are unvaccinated “ is pretty astounding effectiveness, ” she said.“ There is always the illusion that there is a magic bullet that will solve all our problems....
Israeli experts said
综合
环球邮报-世界
2021-07-28 00:00:00.0