BREATHITT DIAGNOSTIC ROUNDS (CONT.)
Te following images demonstrate infection with Teile- ria orientalis (Figure 1) and Anaplasma Marginale (Figure 2) in two different animals.
References: 1. Dinkel et al. A U.S. isolate of Teileria orientalis, Ikeda genotype, is transmitted to cattle by the inva- sive Asian longhorned tick, Haemaphysalis longicornis. Parasites and Vectors. 14, 157 (2021).
2. Southeastern Cooperative Wildlie Disease Study. Reports of Haemaphysalis longicornis in the United States;
https://scwds.shinyapps.io/haemaphysalis/
3. United States Department of Agriculture. Emerging Risk Notice- Teileria orientalis Ikeda. 2021; https://
www.aphis.usda.gov/animal_health/downloads/thei- leria-orientalis-ikeda-notice.pdf
4. Guant SD (2000). Hemolytic Anemias Caused by Blood Rickettsial Agents and Protozoa. In: Schalm’s Veterinary Hematology, 5th Edition. Baltimore, MD. Lippincott Williams & Wilkins, 2000: 154-162.
Figure 1. Bovine blood smear. Merozoites consistent with Teileria orientalis (orange arrows) are observed. Occasional erythrocytes demonstrate basophilic stippling (yellow triangle), indicating the anemic state of the an- imal. Diff-Quick. Magnification 1000x. (Photo credit, Dr. Nathan Helgert)
5. Virginia Cooperative Extension. Managing the Asian Longhorned Tick: Checklist for Best Management Practices for Cattle Producers. 2020; https://www.
pubs.ext.vt.edu/ENTO/ENTO-382/ENTO-382. htm
Figure 2. Bovine blood smear.
Rickettsial bacterium
consistent with Anaplasma marginale (red arrows) are ob- served. Te field contains a single neutrophil, and occa- sional crenated erythrocytes. Diff-Quick. Magnification 1000x. (Photo credit, Dr. Nathan Helgert)
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