Members' NAVLE study guide

Feline GI Parasites: Worms, Giardia, Coccidia | NAVLE

1,731 words 7 min read 1 figure Reviewed November 14, 2026

Intestinal parasites are routine findings in cats, especially kittens, and several of them infect people. Most infections cause few signs, so the exam usually asks which parasite fits a fecal result, which test finds it, which drug treats it and whether it is a public health concern.

Key facts

Gastrointestinal endoparasitism at a glance
  • Species and system: cat, small intestine.
  • Roundworms: Toxocara cati (the important one) and Toxascaris leonina; also Toxocara malaysiensis in parts of eastern Asia.
  • Hookworms: Ancylostoma tubaeforme (worldwide), A. braziliense (southeastern US coast, tropics), Uncinaria stenocephala (cooler regions).
  • Tapeworms: Dipylidium caninum (fleas) and Taenia taeniaeformis (rodents).
  • Protozoa: Giardia duodenalis and Isospora felis / I. rivolta.
  • Zoonotic: T. cati, hookworms (especially A. braziliense) and Giardia assemblages A and B; Isospora is host-specific.

What's inside

12 sections in the full guide
  1. Key facts
  2. How the NAVLE tests this
  3. Cause and life cycles
  4. Clinical signs
  5. Diagnosis
  6. Differential diagnoses
  7. Treatment and management
  8. Prevention, control and public health
  9. Prognosis
  10. Quick review
  11. Test yourself
  12. References
The full guide also has 5 tables, 1 figure, 3 self-test questions and 8 references, available to NAVLE members.

Read the full study guide

The full guide is part of every NAVLE plan, with diagnosis and treatment tables, figures, a quick review and self-test questions. Start a free trial to try the question bank, or log in if you are already a member.

Read the free overview article A shorter, free article on Gastrointestinal endoparasitism on the NavleExam blog.

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