Naked, ⊕ ssRNA, linear

PERCHPoliovirus – polio-Salk/Sabin vaccines – IPV/OPVEchovirus – aseptic meningitisRhinovirus – "common cold"Coxsackievirus – aseptic meningitis; herpangina (mouth blisters, fever); hand, foot, and mouth disease; myocarditis; pericarditis HAV - acute viral hepatitis

- RNA is translated into 1 large polypeptide that is cleaved by proteases into functional viral proteins.