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Coinfection with influenza A virus enhances SARS-CoV-2 infectivity #MMPMID33603116
Bai L; Zhao Y; Dong J; Liang S; Guo M; Liu X; Wang X; Huang Z; Sun X; Zhang Z; Dong L; Liu Q; Zheng Y; Niu D; Xiang M; Song K; Ye J; Zheng W; Tang Z; Tang M; Zhou Y; Shen C; Dai M; Zhou L; Chen Y; Yan H; Lan K; Xu K
Cell Res 2021[Apr]; 31 (4): 395-403 PMID33603116show ga
The upcoming flu season in the Northern Hemisphere merging with the current COVID-19 pandemic raises a potentially severe threat to public health. Through experimental coinfection with influenza A virus (IAV) and either pseudotyped or live SARS-CoV-2 virus, we found that IAV preinfection significantly promoted the infectivity of SARS-CoV-2 in a broad range of cell types. Remarkably, in vivo, increased SARS-CoV-2 viral load and more severe lung damage were observed in mice coinfected with IAV. Moreover, such enhancement of SARS-CoV-2 infectivity was not observed with several other respiratory viruses, likely due to a unique feature of IAV to elevate ACE2 expression. This study illustrates that IAV has a unique ability to aggravate SARS-CoV-2 infection, and thus, prevention of IAV infection is of great significance during the COVID-19 pandemic.