claim: influenza may limit the spread of sars-cov-2
evidence_1: these results suggest the need to increase vaccination against influenza, not only to reduce the burden due to influenza viruses, but also to counteract their facilitatory impact on sars-cov-2.", "we found consistent evidence for a 2-2.5-fold population-level increase in sars- cov-2 transmission associated with influenza during the period of co- circulation.", "here we hypothesized that influenza interacted with sars-cov-2 during the early 2020 epidemic of covid-19 in europe.")