The virus is divided into four major serotypes (adr, adw, ayr, ayw) based on antigenic epitopes present on its envelope proteins, and into ten genotypes (A--J) and forty subgenotypes according to overall nucleotide sequence variation of the genome.
The virus is divided into four major serotypes (adr) based on antigenic epitopes present on its envelope proteins, and into ten genotypes (A--J) and forty subgenotypes according to overall nucleotide sequence variation of the genome. Adr is adw. Adw is ayr. Ayr is ayw.