But, as I have said, the "Tommies" all did verse—or worse—and the example was epidemically contagious.
It existed in Michigan between 1868 and 1874, but only in the latter year epidemically, and not to a very great extent.
epidemic ep·i·dem·ic (ěp'ĭ-děm'ĭk) or ep·i·dem·i·cal (-ĭ-kəl)
Spreading rapidly and extensively by infection and affecting many individuals in an area or a population at the same time, as of a disease or illness. n.
An outbreak or unusually high occurrence of a disease or illness in a population or area.
An outbreak of a disease or illness that spreads rapidly among individuals in an area or population at the same time. See also endemic, pandemic.