Human (Granulocytic) Anaplasmosis (HGA ... - Allina Health

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Your Pets A study from Austria showed no increased seroprevalence for Anaplasma phagocytophilum in cat or dog owners compared to non-pet owners, suggesting that pets are not a likely source of infection. In Europe and possibly in Washington state, transmission of Babesia divergens by Ixodes ricinus to humans has been reported. More About Ixodes scapularis (Deer Tick, Blacklegged Tick): Reservoir hosts for HGA in the United States of America are the white-footed mouse (transient bacteremia of 1-4 weeks), other small mammals, and the white-tailed deer (persistent subclinical infection vs merely supplying the food source). Humans are infected with tick-borne diseases when they come into contact with the tick vector in reservoir animal habitats. Peak tick activity is April through September. High risk counties in Minnesota include the eastern two-thirds of the state, in the approximate mid-portion, in a swath oriented from northwest to southeast extending to the St. Croix River region. The ticks are found in wooded and brushy areas but may reside in your own back yard, especially if you live adjacent to woods or have abundant brush or leaf litter in your yard. Ixodes scapularis life cycle Engorged Ixodes scapularis tick Adult ticks are approximately 1/8 inch long. Nymphs are slightly less than 1/16 inch long. Typically the tick must be attached for at least 12-24 hours in order to transmit the bacteria (although this may be shorter for HGA). Not all ticks carry the culprit organisms. Additional photographs of the deer tick are available on CDC and MDH web sites. For information on preventing tick-borne disease and how to remove ticks, visit the MDH web site 10
REFERENCES K. Annen, D.O., et al. Two Cases of Transfusion-Transmitted Anaplasma phagocytophilum. Am J of Clin Path. 2012;137:562-565. Skerget M, et al. Cat or Dog Ownership and Seroprevalence of Ehrlichiosis, Q Fever, and Cat-Scratch Disease. Emerg Infect Dis. 2003;9:1337-1339. McKechnie, D.B., et al. Survival of Ehrlichia chaffeensis in Refrigerated ADSOL-Treated RBCs. Transfusion. 2000; 40:1041-1047. Minnesota Department of Health web site: www.health.state.mn.us/ Mayo Medical Laboratories web site: MayoMedicalLaboratories.com Personal Communication, American Red Cross, www.redcrossmn.org Centers for Disease Control web site: www.cdc.gov/ Henry’s Clinical Diagnosis and Management by Laboratory Methods, 21 st Edition, 2007, Publisher Saunders Elsevier, ISBN: 978-1-4160-0287-1 HGA: G. Woods M.D., D Walker M.D., “Chlamydial, Rickettsial, and Mycoplasmal Infections”, pp. 1007-1008 Babesiosis: T. Fritsche, M.D. and R. Selvarangan, B.V.Sc., “Medical Parasitology”, pp. 1134-1135 E. Vannier and P. Krause, “Human Babesiosis”, New England Journal of Medicine June 21, 2012; 366;25, pp. 2397-2407 For questions, comments, or suggestions about this newsletter or other laboratory issues, please contact Lauren Anthony, MD, Medical Director of Allina Medical Laboratories, (612) 863-0409 or Lauren.Anthony@allina.com 11
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Human (Granulocytic) Anaplasmosis (HGA ... - Allina Health

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