Feline External Parasites Study Guide
Overview and Clinical Importance
External parasites (ectoparasites) represent one of the most common dermatological problems in feline practice. These organisms cause morbidity through direct tissue damage, hypersensitivity reactions, and disease transmission. Major external parasites affecting cats include fleas (Ctenocephalides felis), ear mites (Otodectes cynotis), mange mites (Demodex, Notoedres, Cheyletiella), and ticks.
Fleas (Ctenocephalides felis)
The cat flea (Ctenocephalides felis) is the most common ectoparasite affecting cats worldwide, responsible for over 90% of flea infestations on both cats and dogs. C. felis is not host-specific and will readily parasitize dogs, rabbits, ferrets, and humans.
Morphology and Identification
Adult cat fleas are 1-3 mm in length, reddish-brown to black, wingless, and laterally compressed. Key identification features include:
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