Concurrent Triple Parasitic Infection (Ctenocephalides canis, Rhipicephalus sanguineus, and Toxocara canis) in a Domestic Dog from Bangladesh: Clinical Management and Zoonotic Implications
This case report documents the successful diagnosis and treatment of a rare concurrent triple parasitic infection involving *Ctenocephalides canis*, *Rhipicephalus sanguineus*, and *Toxocara canis* in a dog from Bangladesh. The diagnosis was confirmed through both gross examination and detailed stereomicroscopic morphological identification using the characteristic features of each parasite. Published reports describing concurrent infection with *Ctenocephalides canis*, *Rhipicephalus sanguineus*, and *Toxocara canis* in a single dog remain scarce. The report highlights the clinical efficacy of a regimen where the dog received a single oral combination product containing sarolaner, moxidectin, and pyrantel pamoate, together with supportive care. Sarolaner eliminated fleas and ticks—vectors for dangerous diseases such as ehrlichiosis and Rocky Mountain spotted fever—while moxidectin and pyrantel pamoate treated the intestinal roundworm infection. The study emphasizes the importance of routine screening to mitigate zoonotic risks, as *Toxocara canis* can infect humans when infective eggs from contaminated environments are accidentally ingested, potentially causing visceral or ocular toxocariasis.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Imagine a dog as a busy, living city. In this city, different types of "unwanted tenants" can move in and cause trouble. Usually, a dog might have just one type of troublemaker, like a few fleas or a single roundworm. But in this specific case report from Bangladesh, a 2-year-old dog walked into a veterinary clinic with a very crowded apartment: it was hosting three different kinds of parasites at the exact same time.
Here is the story of that triple invasion, broken down simply:
The Three Unwanted Guests
The dog was suffering from intense itching, looked very thin, and had tummy troubles. When the vet examined the dog, they found three distinct invaders, each with its own "ID card" (unique physical features) that allowed them to be identified under a microscope:
- The Fleas (Ctenocephalides canis): Think of these as tiny, dark-brown, jumping hitchhikers. They have special "combs" on their heads (like a hairbrush made of spikes) that help them hold onto the dog's fur. They were the cause of the dog's severe itching.
- The Ticks (Rhipicephalus sanguineus): These are the reddish-brown, flat, oval-shaped bugs that look like little seeds when they haven't eaten yet. The key to spotting them was their "head," which has a unique hexagonal (six-sided) shape, like a tiny stop sign.
- The Roundworms (Toxocara canis): These are the internal tenants. They are long, white, spaghetti-like worms living inside the dog's gut. The vet identified them by looking at their front ends, which have three distinct "lips" and wing-like structures called cervical alae.
The Diagnosis: A Triple Threat
Finding one of these is common. Finding two is less common. Published reports describing concurrent infection with Ctenocephalides canis, Rhipicephalus sanguineus, and Toxocara canis in a single dog remain scarce. The vet team acted like detectives, confirming the diagnosis through both gross examination and detailed stereomicroscopic morphological identification using the characteristic features of each parasite. They checked specific "features" of each bug—like the shape of a tick's head or the combs on a flea's face—to confirm that this was indeed a triple infection.
The Solution: A "Three-in-One" Cleanup
Instead of treating each problem separately, the vet used a powerful, all-in-one strategy. The dog received a single oral combination product containing sarolaner, moxidectin, and pyrantel pamoate, together with supportive care.
- Sarolaner eliminated fleas and ticks, while moxidectin and pyrantel pamoate treated the intestinal roundworm infection.
- Supportive care (like soothing shampoo and a special diet) helped the dog's skin and stomach heal while the medicines did their work.
They also told the owner to clean the dog's house thoroughly, because parasites can hide in the environment (like eggs in the carpet) and re-infect the dog if not removed.
The Result: A Happy Recovery
The treatment worked like a charm.
- Within 48 hours: The dog stopped itching so much and started eating again.
- After 14 days: No bugs were visible on the dog, and a test of the dog's poop showed no worm eggs.
- After 30 days: The dog was completely healthy and back to normal.
Why This Matters to Humans (The "One Health" Lesson)
The paper emphasizes that this isn't just about a sick dog; it's about human safety too.
- Toxocara canis can infect humans when infective eggs from contaminated environments are accidentally ingested, potentially causing visceral or ocular toxocariasis.
- The ticks are known to carry other dangerous diseases that can infect humans, such as ehrlichiosis and Rocky Mountain spotted fever.
The main takeaway is that keeping dogs healthy is a team effort involving pet owners, vets, and public health officials. By treating dogs for these parasites and keeping their environments clean, we protect both the animals and the people who love them. This case shows that when a dog has a "triple threat" of parasites, a smart, combined treatment plan can fix the problem quickly and safely.
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