Guinea Pig Endoparasites Study Guide

Overview and Clinical Importance

Endoparasites in guinea pigs (Cavia porcellus) represent an important category of disease that veterinarians must recognize on the NAVLE. While parasitic infections are generally less common in pet guinea pigs compared to production animals, they can cause significant morbidity, particularly in young, stressed, or immunocompromised animals. Guinea pigs are hindgut fermenters with a sensitive gastrointestinal flora, making them susceptible to secondary complications from parasitic infections. Understanding the identification, diagnosis, and treatment of these parasites is essential for small mammal practice.

The most clinically significant endoparasites affecting guinea pigs include: Eimeria caviae (coccidiosis), Cryptosporidium wrairi (cryptosporidiosis), Paraspidodera uncinata (pinworm-like nematode), Giardia duodenalis (giardiasis), and Encephalitozoon cuniculi (microsporidiosis). Surveys indicate that approximately 12-32% of pet guinea pigs harbor intestinal parasites, with higher prevalence in breeding colonies and pet store populations.

Section 1: Protozoal Parasites

1.1 Coccidiosis (Eimeria caviae)

Eimeria caviae is the only species of coccidia that infects guinea pigs. It is a colonic coccidian belonging to the phylum Apicomplexa. Coccidiosis is the most common protozoal infection in guinea pigs and is particularly significant in breeding colonies, pet stores, and young weanling animals.