Which of the following helminths is rare in cats in the continental United States?

Trichuris felis, commonly known as the cat whipworm, is indeed rare in cats in the continental United States. While whipworms can be a significant concern in certain animal populations, Trichuris felis has a low prevalence in the feline population, especially compared to other species such as dogs.

In contrast, Ancylostoma tubaeformae is a type of hookworm that does present in cats and can cause issues such as anemia. Dipylidium caninum, the cucumber tapeworm, is also quite common in felines, typically transmitted through fleas. Strongyloides stercoralis is another helminth that, although primarily affecting dogs, can also be found in cats, albeit less frequently.

The rarity of Trichuris felis in U.S. cats signifies that while it is a potential parasite for cats, it does not pose the same level of risk or prevalence as the other helminths mentioned. This understanding is relevant for veterinarians and pet owners in assessing and managing the health of cats regarding parasitic infections.