Genus: Iltovirus

Genus: Iltovirus

Distinguishing features

The predicted amino acid sequences of members form a distinct lineage within the subfamily (Figure 1.Alphaherpesvirinae).


See discussion under family description.

Genome organization and replication

Eight of the protein-coding regions predicted in the genome of infectious laryngotracheitis virus (ILTV in the species Gallid alphaherpesvirus 1) are unique to members of the genus. Other unusual characteristics of the ILTV genome are the translocation of gene UL47, which is located in UL in the members of other genera in the subfamily, to US, and the inversion of a sizeable part of UL containing genes UL22–UL44.


Members have birds as hosts, including galliforms (i.e. ground-feeding birds such as turkeys, chickens and quail) and psittacids (i.e. parrots). ILTV is highly contagious in chickens and causes significant economic losses in egg-laying flocks.

Species demarcation criteria

See discussion under family description.

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Gallid alphaherpesvirus 1gallid alphaherpesvirus 1; infectious laryngotracheitis virusSA2JN596962Complete genomeGaAHV1; ILTV
Psittacid alphaherpesvirus 1psittacid alphaherpesvirus 1; Pacheco's disease virus97-0001AY372243NC_005264Complete genomePsAHV1; PDV

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.