After the recognition of the pandemic extent of SARS-CoV-2 infection in mid-February 2020, indicators of flu activity began to decrease in the northern hemisphere. These changes have been attributed, both to artifacts due to the decline in the search for influenza pathology, a notion to be taken with extreme caution, and to real changes in the circulation of the flu virus due to the widespread implementation of measures to mitigate the transmission of SARS-CoV-2.