Echovirus 23 is now classified as Human parechovirus 2.
Immunogen: Picornavirus, Enterovirus, Echovirus 23, Strain Williamson
Source of antibody: Rhesus monkey
Propagated in: rhesus monkey kidney cells in tissue culture
Adjuvant: 1 part Arlacel A plus 9 parts Bayol F with equal amounts of undiluted suspension of virus