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Infection and Immunity, May 2000, p. 3023-3027, Vol. 68, No. 5
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Strain Diversity in Major Surface Protein 2 Expression during Tick Transmission of Anaplasma marginale

Fred R. Rurangirwa,1 David Stiller,1,2,3 and Guy H. Palmer1,*

Program in Vector-Borne Diseases, Washington State University, Pullman, Washington, 99164-70401; Animal Diseases Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Pullman, Washington 99164-70302; and Agricultural Research Service, U.S. Department of Agriculture, Moscow, Idaho 83844-22013

Received 20 October 1999/Returned for modification 3 January 2000/Accepted 22 February 2000

Specific major surface protein 2 (MSP2) variants are expressed by Anaplasma marginale within the tick salivary gland and, following transmission, are expressed during acute rickettsemia. In previous work, we have shown that a restricted pattern of MSP2 variants is expressed in the salivary glands of Dermacentor andersoni ticks infected with the South Idaho strain of A. marginale. Now we demonstrate that the identical restriction does not apply to two other strains of A. marginale, and that different variants are also expressed when the same strain is transmitted by different Dermacentor spp. This indicates that antigenic diversity among strains is maintained in tick transmission and may be a significant constraint to MSP2 vaccine development.

* Corresponding author. Mailing address: Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040. Phone: (509) 335-6033. Fax: (509) 335-8529. E-mail: gpalmer{at}vetmed.wsu.edu.

Infection and Immunity, May 2000, p. 3023-3027, Vol. 68, No. 5
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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