ClinQuiz: Ectoparasites - Answer 3B Aug 14, 2008 By dvm360.com staff VETERINARY MEDICINE Incorrect. This organism is a morula of Ehrlichia ewingii, within a neutrophil. Penicillins are not effective against rickettsial infections. Try again View references Hot topics on dvm360Pet Owner 2.0: A dvm360 Leadership Challenge Veterinary issues in 2016: Will this be the year of telemedicine? Top 8 nastiest things to clean at a veterinary practice The 12 days of veterinary client handouts Need a urine sample? Urine luck!