🔍 What Is Physalopterosis?

Physalopterosis is a parasitic infection of a cat’s stomach caused by adult worms of the genus Physaloptera. These stout, pink-tan nematodes (3–6 cm long) attach to the gastric lining and cause chronic gastritis and vomiting :contentReference[oaicite:3]{index=3}.

• Usually only a few worms (1–3) are present, but even one can cause significant vomiting :contentReference[oaicite:4]{index=4}.
• Infections are uncommon but should be considered in outdoor cats with chronic vomiting.

1. Life Cycle & Transmission

• Eggs are shed in feces, ingested by insect intermediate hosts (cockroaches, beetles, crickets), where they develop into infectious larvae :contentReference[oaicite:5]{index=5}.
• Cats become infected by eating infected insects or paratenic hosts (rodents, reptiles, amphibians) :contentReference[oaicite:6]{index=6}.
• Adult worms mature in the stomach lining 2–5 months post-infection :contentReference[oaicite:7]{index=7}.

2. Clinical Signs

• Chronic or intermittent vomiting—often undigested or containing mucus; occasionally, worms may appear in vomit :contentReference[oaicite:8]{index=8}.
• Signs range from normal energy to mild inappetence; severe infections may cause gastritis, weight loss, or anemia :contentReference[oaicite:9]{index=9}.
• Cats typically remain bright unless secondary conditions develop.

3. Diagnosis

• Endoscopy: gold-standard—direct visualization and removal of adult worms :contentReference[oaicite:10]{index=10}.
• Vomit/fecal exam: worms may appear in vomitus; eggs are visible in direct smears but rarely on floats :contentReference[oaicite:11]{index=11}.
• Fecal sedimentation may occasionally reveal eggs; standard flotation is insensitive :contentReference[oaicite:12]{index=12}.
• Clinical suspicion should be higher in vomiting cats with outdoor exposure and insect ingestion history.

4. Treatment Options

a. Endoscopic Removal

• Recommended when accessible—already therapeutic and informative.
• Follow-up with anthelmintics even after worm removal to ensure full clearance :contentReference[oaicite:13]{index=13}.

b. Anthelmintic Therapy

• Pyrantel pamoate: 20 mg/kg PO every 2 weeks × 3 doses (CAPC protocol) :contentReference[oaicite:14]{index=14}.
• Ivermectin: 0.2 mg/kg SC or PO × two doses 2 weeks apart :contentReference[oaicite:15]{index=15}.
• Fenbendazole: considered in some regimens (e.g., dogs); used off-label :contentReference[oaicite:16]{index=16}.
• Repeated courses may be needed until vomiting subsides and no eggs/worms are seen :contentReference[oaicite:17]{index=17}.

c. Supportive Care

• GI soothing diets, antiemetics, hydration support, and gastric mucosa protectants.
• Severe gastritis may respond to short-term low-dose corticosteroids :contentReference[oaicite:18]{index=18}.

5. Prognosis & Follow‑Up

• Good prognosis with successful worm removal and effective anthelmintic therapy.
• Vomiting often resolves within 2 weeks; follow-up diagnostics recommended :contentReference[oaicite:19]{index=19}.
• Re-infection is possible; continued monitoring important.
• No zoonotic risk—Physaloptera does not infect humans :contentReference[oaicite:20]{index=20}.

6. Prevention & Control

• Keep cats indoors and reduce access to insects and rodent prey :contentReference[oaicite:21]{index=21}.
• Control insect infestations in the home/yard.
• Use monthly broad-spectrum parasite control that includes nematodes :contentReference[oaicite:22]{index=22}.
• Prompt fecal cleanup and hygiene reduce environmental contamination.

7. Role of Ask A Vet Remote Support

• 📹 Owners can upload videos/photos of vomiting episodes to help triage severity.
• 🔔 Receive reminders for dosing schedules and recheck appointments.
• 💡 Remote advice on dietary management and when medical re-evaluation is needed.
• 📊 Track vomiting frequency, worm passage, weight changes, and overall response.

8. FAQs

Can my indoor cat still get this?

Less likely—but possible via indoor insects (e.g., cockroaches). Prevent by maintaining insect control.

My cat vomited a worm—is that good?

Yes—seeing an adult worm confirms diagnosis. Still complete treatment and recheck.

Do we need to treat every vomit episode?

Not all vomiting is due to Physaloptera. If chronic and associated with other signs, investigate and treat accordingly.

What if vomiting continues despite treatment?

Repeat endoscopy or fecal exams may be needed; consider alternative diagnoses.

Conclusion

Physalopterosis in cats is a treatable cause of chronic vomiting. With endoscopic removal, targeted anthelmintics like pyrantel, and supportive care, most cats recover fully. Prevent reinfection by limiting prey access and maintaining parasite control. Remote monitoring via Ask A Vet enhances care continuity, ensuring early detection, compliance, and improved outcomes 🐾📲.

If your cat has intermittent vomiting—especially with outdoor exposure—consider Physaloptera. Consult your veterinarian or reach out via Ask A Vet for tailored diagnosis and treatment support.