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美国流行病学家认为，美国当前处于应对新冠肺炎疫情的“新阶段”，疫情正在“极其广泛地蔓延”。专家警告说，美国冬季可能遭遇流感和新冠病毒“双重”暴发。 Public health experts, researchers and manufacturers warn the coming flu season could bring a “double-barrel” respiratory disease outbreak in the United States, just as fall and winter are expected to exacerbate the spread of Covid-19. 新冠病毒的传播预计会在秋冬季加剧，公共卫生专家、研究人员和制造商警告说，美国即将到来的流感季可能会带来“双重”呼吸道疾病的暴发。 | 
