(名詞/可數) 流感和新冠肺炎同時爆發大流行。

As public health officials look to fall and winter, the specter of a new surge of Covid-19 gives them chills. But there is a scenario they dread even more: a severe flu season, resulting in a “twindemic.” … The concern about a twindemic is so great that officials around the world are pushing the flu shot even before it becomes available in clinics and doctors’ offices.
[, 16 August 2020]