Coxsackie viruses. Coloured transmission electron micrograph (TEM) of a group of Coxsackie viruses. These viruses were named after the town in the USA where they were isolated. They are entero- viruses, part of the Picornaviridae group. This group contains small, non-enveloped, icosahedral- shaped viruses. Coxsackie viruses, of which there are many types, cause diseases such as aseptic meningitis; herpangina, an acute pharyngitis; hand, foot and mouth disease (not foot and mouth); epidemic myalgia or Bornholm disease; and myocarditis of newborn babies. They are also among the miscellaneous viruses that cause colds. Magnification: unknown.