From the passage identify the subtypes of Hepatovirus A. Display the results in comma separated format.

Hepatovirus A is a species of virus in the order Picornavirales, family Picornaviridae, genus Hepatovirus. Humans and other vertebrates serve as natural hosts.[18][19]

Nine members of Hepatovirus are recognized.[20] These species infect bats, rodents, hedgehogs, and shrews. Phylogenetic analysis suggests a rodent origin for Hepatitis A.[citation needed]

A member virus of hepatovirus B (Phopivirus) has been isolated from a seal.[21][22] This virus shared a common ancestor with Hepatovirus A about 1800 years ago.[citation needed]

Another hepatovirus – Marmota himalayana hepatovirus – has been isolated from the woodchuck Marmota himalayana.[23] This virus appears to have had a common ancestor with the primate-infecting species around 1000 years ago.[citation needed]

One serotype and seven different genetic groups (four human and three simian) have been described.[24] The human genotypes are numbered I–III. Six subtypes have been described (IA, IB, IIA, IIB, IIIA, IIIB). The simian genotypes have been numbered IV–VI. A single isolate of genotype VII isolated from a human has also been described.[25] Genotype III has been isolated from both humans and owl monkeys. Most human isolates are of genotype I.[26] Of the type I isolates subtype IA accounts for the majority.

The mutation rate in the genome has been estimated to be 1.73–9.76 × 10−4 nucleotide substitutions per site per year.[27][28] The human strains appear to have diverged from the simian about 3600 years ago.[28] The mean age of genotypes III and IIIA strains has been estimated to be 592 and 202 years, respectively.[28]

IA, IB, IIA, IIB, IIIA, IIIB