Twindemic and tripledemic (or tridemic) are terms used during the COVID-19 pandemic, referring to the possibility of a severe flu season happening alongside an increase in cases of COVID-19 during the fall and winter of 2020 and 2021,[1][2][3][4][5] as well as respiratory syncytial virus in the winter of 2022. A consequence of a twindemic may be a mixture of two different infections in the same person at the same time.[6] The term twindemic is a portmanteau of "twin" and "pandemic".[3]
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was invoked but never defined (see the help page).