ATCC® Number:VR-1436™
Classification: Rickettsiae
Agent: Anaplasma marginale Theiler
Strain: South Idaho, USA (S64-Id2AM)
Original Source: Whole blood from a naturally infected 13 year old Hereford cow from south-central Idaho herd
Depositors: W Goff, D Stiller
Biosafety Level:3
Shipped: frozen
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Host Organism : cattle (Bos taurus) Bos taurus; Bos indicus; Bison bison; Cervus elaphus; other wild ungulates
Incubation : Duration: Using 10(8) infected erythrocytes, 20-26 days needle challenge (IV); 33-38 days tick transmitted
Effect : Yes, in vivo effects: Decreased hematocrit resulting in mild to severe anemia and if immunocompromised, death
Comments : Officially recognized as reference strain by Veterinary Hemoparasite Research Workers of the Society for Tropical Veterinary Medicine.
References : 33173: Zaugg JL, et al. Transmission of Anaplasma marginale Theiler by males of Dermacentor andersoni Stiles fed on an Idaho field-infected, chronic carrier cow. Am. J. Vet. Res. 47: 2269-2271, 1986. PubMed: 3777655