Anaplasma marginale: Lack of cross-protection between strains that share MSP1a variable region and MSP4

• Published in: Veterinary microbiology Vol. 114; no. 1; pp. 34 - 40
• Main Authors: Ocampo Espinoza, Verónica, Vázquez, J. Eduardo Salazar, Aguilar, Marina Durán, Ortiz, Miguel Ángel García, Alarcón, Germinal J. Cantó, Rodríguez, Sergio D.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 16-04-2006; Elsevier Science
• Subjects: Anaplasma marginale; Anaplasma marginale - classification; Anaplasma marginale - immunology; Anaplasma marginale - pathogenicity; Anaplasmosis - immunology; Anaplasmosis - microbiology; Anaplasmosis - prevention & control; Animals; Bacterial Outer Membrane Proteins - immunology; Bacterial Proteins - immunology; Bacterial Vaccines - immunology; Bacteriology; Biological and medical sciences; Cattle; Cattle Diseases - immunology; Cattle Diseases - microbiology; Cattle Diseases - prevention & control; Erythrocytes - microbiology; Female; Fundamental and applied biological sciences. Psychology; Immunity; Membrane Proteins - immunology; Microbiology; Miscellaneous; MSP1a; MSP4; Protection; Strains; Vaccination - veterinary; Cattle; Strains; MSP1a; Anaplasma marginale; Immunity; Protection; MSP4; Bovine; Microbiology; Cross protection; Variable region; Anaplasmataceae; Strain; Rickettsiales; Vertebrata; Mammalia; MSP1a: MSP4; Bacteria; Artiodactyla; Veterinary; Ungulata
• ISSN: 0378-1135; 1873-2542
• DOI: 10.1016/j.vetmic.2005.11.058

In Mexico, there are no commercial alternatives for the immunoprophylaxis of bovine Anaplasmosis, a disease responsible for great economic losses. Blood derived
Anaplasma marginale used for immunizing susceptible cattle has shown promising results for homologous protection and controversial results against unrelated strains. The present study examined, under controlled conditions, the cross-protective potential of an immunogen composed of blood derived
A. marginale of three strains against challenge with strains not included in the immunogens. Groups 1 and 2 were immunized with blood derived
Anaplasma from strains Mexico, Morelos and Yucatan, group 4 with strains Morelos, Veracruz and Yucatan, two more groups (2 and 5) of equal conditions were inoculated with an adjuvant alone. Groups 1, 4 and 5 were challenged with Mexico strain; groups 2 and 3 were challenge-inoculated with strain Veracruz; groups 3 and 5 with strains Veracruz and Mexico as controls. Only animals in group 1, immunized and challenged with strain Mexico showed adequate protection. Both groups challenged with strains not included in the immunogens developed poor protection, while all the controls had to be treated to prevent death.