Marmoset herpesvirus Synonym for

Saimiriine herpesvirus 1.

marmosetpox virus (MPV) An unassigned virus in the family Poxviridae. Virion morphology like Yatapox virus.

Marrakai virus (MARV) A serotype of Palyam virus in the genus Orbivirus. Isolated from the mosquitoes Culicoides schultzei and C. perigrinus in Northern Territory, Australia.

Marshall-Regnery myxoma virus

Marshall-Regnery myxoma virus A strain of Myxoma virus in the genus Leporipoxvirus. Isolated from the California brush rabbit.

marsupial papillomavirus Synonym for quokka poxvirus.

marsupial poxvirus See quokka poxvirus.

MARU 10962 virus (GAMV) A mosquito isolate of Gamboa virus in the genus Bunyavirus.

masern virus Synonym for Measles virus.

Mason-Pfizer monkey virus (MPMV) A

species in the genus Betaretrovirus. Isolated from a spontaneous mammary carcinoma in an 8-year-old rhesus monkey. Can be propagated in human and non-human primate cell cultures. Morphologically type D, similar to Mouse mammary tumor virus but has no prominent surface spikes. The genome RNA is 8kb in length with LTRs of 350nt (U3-240, R-15, U5-95). There are no genome-associated oncogenes. Transforms rhesus foreskin cells in culture but injection into monkeys has not resulted in any mammary tumors. Strains have been isolated from placental tissues of normal rhesus monkeys and from HeLa cell lines. Approximately 20% of the viral genetic sequences are present in rhesus tissue as endogenous provirus. Similar sequences are present in other Old World monkeys but not in the cell DNA of New World monkeys, apes or humans. Differs from other retroviruses by assembling Gag polyproteins into procapsids in the cytoplasm.

Sakalian M and Hunter E (1999) J Virol 73, 8073

Masou salmon reovirus (MSRV) An isolate of Aquareovirus A in the genus Aquareovirus. Isolated from land-locked salmon, Oncorhynchus masou. See also landlocked salmon reovirus.

Hsu YL et al (1989) Fish Pathol 24, 37

Mastadenovirus A genus in the family Adenoviridae comprised of the species isolated from mammals. The type species is Human adenovirus C. Twenty species have been recognized, which all share a common antigen. The 12 vertex cap-

someres each have a single filament which varies in length in different species. The double-stranded DNA genome is 36 kb in length, mol. wt. 20-25 x 106. G+C content 48-61% in different viruses. Many hemagglutinate. Lack of cross-neutralization combined with a calculated phylogenetic distance of more than 10% separate two serotypes into different species.

mast cell A connective tissue cell with numerous large basophilic metachro-matic granules in the cytoplasm.

mastocytoma A tumor of neoplastic mast cells.

Matariya serogroup viruses Two unclassified arboviruses isolated from birds in Africa: Burg el Arab Matariya

Matariya virus An unclassified arbovirus. The first member of the Matariya serogroup. Isolated from birds of Sylvia sp in Egypt. Probably also present in Europe since the birds were viremic on arrival in Egypt. Not reported to cause disease in the wild.

mathematical modeling A technique used in experimental epidemiology to study, for example, the effects of an intervention such as vaccination on the progress of an epidemic within a community.

Hethcote HW et al (1991) Math Biosci 106, 203

matrix protein A term used for several different types of protein. In ortho- and paramyxoviruses and rhabdoviruses it refers to the protein between the viral membrane and the nucleocapsid.

Matruh virus (MTRV) A serotype of Tete virus in the genus Bunyavirus. Isolated from birds in Egypt and Italy. Not reported to cause disease in the wild.

Matucare virus (MATV) A tentative species in the genus Orbivirus, isolated from the tick, Ornithodoros boliviensis, in the San Joaquin area, Beni, Brazil. Antibodies found in bats. Not reported to cause disease in humans.

maturation The final process in assembly of the mature progeny virion during replication. It may occur inside the cell (e.g. picornaviruses, reoviruses, papova-viruses, adenoviruses, herpesviruses and poxviruses), in which case cell lysis is needed for egress. Alternatively, maturation may be linked with egress from the cell as seen with most enveloped viruses (e.g. negative-strand viruses, togaviruses and retroviruses).

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