Introduction picornavirus Picornaviruses are broken into 3 groups enteroviruses acid-stable most common in children fecal-oral transmission can cause aseptic (viral) meningitis login to view 1 more bullet can cause acute flaccid paralysis, acute disseminated myelitis, and acute transverse myelitis includes login to view 3 more bullets rhinoviruses not acid-stable grows at 33°C includes login to view 1 more bullet hepatovirus hepatitis A virus Characteristics small ("pico-RNA-virus") naked capsid (non-enveloped) resistant to alcohol and detergents highest incidence in summer and fall seasons RNA single-stranded positive-sense linear icosahedral Translation process is unique RNA translated into 1 large polypeptide polypeptide then cleaved to form functional viral proteins