Iodo2deoxyuridine See idoxuridine

Iopaka virus An unclassified arbovirus isolated in the Amazon region of Brazil.

Ipixaia virus A possible species in the genus Orbivirus, isolated from phle-botomine sandflies in the Amazon region

Ipixaia virus

of Brazil. Antigenically related to Changuinola virus. Not known to cause disease in humans.

Ippy virus (IPPYV) A species in the genus Arenavirus. Isolated in suckling mice from the pooled liver, spleen and brain of an adult rat of Arvicanthis sp trapped in Ippy, Central African Republic. Not known to cause disease in humans.

IPV Inactivated poliovirus.

Iridoviridae A family of large DNA-con-taining viruses, 120-200nm in diameter, having icosahedral symmetry. Virions contain many proteins, several enzymes, lipid and a single structural unit membrane associated with the viral core. The genome is a single molecule of double-stranded DNA, 140-300 kb in length, G+C content 28-54%, which is circularly permuted with direct terminal repeats. In vertebrate iridoviruses but not insect iridoviruses the DNA is highly methylated. Replication occurs in the cytoplasm. There are four genera: Iridovirus and Chloriridovirus (both of insects); Ranavirus (frogs); and Lymphocystivirus ( fish).

Synonyms: icosahedral cytoplasmic deoxyribovirus; polyhedral cytoplasmic deoxyribovirus.

Essani K and Granoff A (1989) Intervirology 30, 187

Iriri virus An unclassified arbovirus isolated from phlebotomine sandflies in the Amazon region of Brazil.

Irituia virus (IRIV) A strain of Changuinola virus in the genus Orbivirus. Isolated from rodents of Oryzomys sp in Para, Brazil. Not reported to cause disease in humans.

Iruana virus A strain of Changuinola virus in the genus Orbivirus. Isolated from phlebotomine sandflies in the Amazon region of Brazil. Not known to cause disease in humans.

Isfahan virus (ISFV) A species in the genus Vesiculovirus. Antigenically related to Vesicular stomatitis virus. Isolated from the sandfly, Phlebotomus papatasi, in Iran. Animal pathogenicity, growth rate, morphology, CPE and plaque morphology are similar to those of other serotypes. Neutralizing antibodies are common in humans in several regions of Iran. They are also found in gerbils but not in domestic animals. The ecology of the virus may thus be different from that of other serotypes and involve chiefly humans, gerbils and sandflies. Not known to cause disease in humans.

Isiolo virus A strain of Sheeppox virus.

Isla Vista virus (ILV) A species in the genus Hantavirus, isolated from voles, Microtus californicus, in California, USA. ILV, which is closely related to Prospect Hill virus, has not been associated with disease in humans or rodents.

Song W et al (1995) J Gen Virol 76, 3195

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