Materials and methods
We retrospectively screened out two patients infected with both
SARS-COV-2 and IAV in 145 confirmed COVID-19 patients in Wuhan Union
Hospital. Then we searched PubMed (National Library of Medicine,
Washington, DC), Web of Science and CNKI (China National Knowledge
Infrastructure) from January 1 up to May 1, 2020, using a combination of
the following key words: COVID-19, SARS-COV-2, influenza A and
co-infection. We also reviewed the reference lists of retrieved articles
to search for other proper studies. Studies were selected if they met
the flowing criteria: clinical studies and case report on SARS-COV-2 and
IAV co-infection.