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Antigenic Relationships of Flaviviruses with Undetermined Arthropod-Borne Status^*

Irene Varelas-Wesley AND Charles H. Calisher

Abstract. In contrast to most of the arthropod-borne flaviviruses, the flaviviruses with undetermined arthropod-borne status are probably disseminated only by direct contact with excreta (saliva, urine, feces, etc.); however, as yet undescribed arthropod transmission cycles may be found for some of them. Twenty-two of these flaviviruses, including prototype and recently isolated strains, were compared. Biologic properties were defined by infectivity titrations in suckling mice and Vero, LLC-MK₂, and primary Pekin duck embryo cells, and antigenic relationships were defined by complement-fixation and plaque reduction neutralization tests. An antigenic classification scheme is proposed. Antigenic and biologic properties delimit two large clusters. The first, comprising a single antigenic complex, includes those which have yet to be isolated from arthropods, but are likely to be so (Israel turkey meningoencephalitis, Koutango, Negishi and Aroa viruses). The second, encompassing five antigenic complexes, is comprised of viruses which have been isolated exclusively from rodents or bats (Saboya, Carey Island, Dakar bat, Sokuluk, Bukalasa bat, Entebbe bat, Phnom Penh bat, Modoc, Sal Vieja, Jutiapa, San Perlita, Cowbone Ridge, Rio Bravo, Apoi, Tamana bat and Montana Myotis leucoencephalitis viruses) but includes three viruses (Saboya, Sokuluk and Entebbe bat viruses) which may be arthropod-borne, as indicated by replication in mosquito cells in vitro.

Accepted for publication March 5, 1982.

^* This investigation was supported by National Science Foundation grant SPI 78-19169.

Address reprint requests to: Dr. Charles H. Calisher, Vector-Borne Diseases Division, Center for Infectious Diseases, P. O. Box 2087, Fort Collins, Colorado 80522.

Present address: Plum Island Animal Disease Center, Science and Education Administration, U.S. Department of Agriculture, Greenport, New York 11944.

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