ClinQuiz: Ectoparasites - Answer 3A

Article

ClinQuiz: Answer 3A

Correct. The organism depicted in Figure 3B is a morula of Ehrlichia ewingii, which is transmitted to dogs by lone star ticks (Figure 3A). The organisms are morphologically identical to Anaplasma phagocytophilum, which is transmitted by black-legged ticks, or deer ticks (Ixodes species).7,8 Patients usually respond to doxycycline within two or three days.9 However, infections can recrudesce; 28 days of treatment is recommended to better eliminate chronic infections.10

Return to quiz

View references

Newsletter

From exam room tips to practice management insights, get trusted veterinary news delivered straight to your inbox—subscribe to dvm360.

Recent Videos
© 2025 MJH Life Sciences

All rights reserved.