Fleas are most likely to be an intermediate carrier of which parasite?

Fleas are most likely to be an intermediate carrier of which parasite?

• A. Roundworms
• B. Giardia
• C. Hookworms
• D. Tapeworms

Answer: (D)

Fleas serve as intermediate hosts in the life cycle of certain tapeworms, allowing the parasite to develop inside the flea before infecting a pet that ingests the flea during grooming. In the case of a common dog- and cat-infecting tapeworm, the adult worm lives in the pet’s intestine and releases segments containing eggs. Flea larvae swallow those eggs, and inside the flea the tapeworm develops into an infective cysticercoid. When a pet bites or licks at the itchy area and swallows an infected flea, the cysticercoid is released and matures into an adult tapeworm in the pet’s intestine. This makes fleas the typical intermediate carrier for tapeworms. Roundworms and hookworms have different transmission routes, usually involving environment-contaminated eggs or larvae or skin penetration, not a flea-mediated intermediate stage. Giardia is a protozoan spread mainly through contaminated water or environment, not through fleas. Therefore the most likely intermediate carrier among these options is the tapeworm.

Fleas serve as intermediate hosts in the life cycle of certain tapeworms, allowing the parasite to develop inside the flea before infecting a pet that ingests the flea during grooming. In the case of a common dog- and cat-infecting tapeworm, the adult worm lives in the pet’s intestine and releases segments containing eggs. Flea larvae swallow those eggs, and inside the flea the tapeworm develops into an infective cysticercoid. When a pet bites or licks at the itchy area and swallows an infected flea, the cysticercoid is released and matures into an adult tapeworm in the pet’s intestine. This makes fleas the typical intermediate carrier for tapeworms.

Roundworms and hookworms have different transmission routes, usually involving environment-contaminated eggs or larvae or skin penetration, not a flea-mediated intermediate stage. Giardia is a protozoan spread mainly through contaminated water or environment, not through fleas. Therefore the most likely intermediate carrier among these options is the tapeworm.