CATS · Real veterinary cases
Persistent bloody diarrhea in a 6-month-old kitten after antibiotics
A pet owner asked our search engine this exact question. We pulled 36 matching peer-reviewed veterinary case reports from our library of published veterinary papers. Here's what they say — in plain English, with citations.
Plain-English synthesis
## What these cases have in common The majority of these cases involve kittens suffering from chronic diarrhea caused by a parasite called Tritrichomonas foetus. This condition often presents with symptoms like bloody diarrhea and is frequently seen in young cats, particularly those from multi-cat environments or catteries. ## Treatments that worked - **Ronidazole**: This medication was effective in treating Tritrichomonas foetus infections, with around 64% of treated cats showing improvement in their symptoms. - **Supportive care**: Many cases included supportive treatments like hydration and dietary management, which helped alleviate some symptoms, although specific success rates were not detailed. - **Antibiotics for co-infections**: In cases where additional bacterial infections were present, antibiotics helped resolve symptoms, although the specific outcomes varied. ## Outcomes The treatments mentioned were successful in a significant number of cases, particularly with ronidazole showing a good clinical response in over half of the treated kittens. However, some cases did not respond well, indicating variability in treatment effectiveness. ## Next step Bring these specific cases to your vet to discuss whether any sound like your pet's situation.
Conditions worth asking your vet about
These are the specific named diagnoses a vet would typically investigate for this presentation — not categories like “metabolic disorder”, but the actual conditions you can mention by name.
Antibiotic-associated colitis
This condition occurs when antibiotics disrupt the normal gut flora, leading to inflammation of the colon and resulting in diarrhea, which can sometimes be bloody. The recent antibiotic use in this kitten makes this a likely cause.
Tritrichomonas foetus infection
A protozoal infection that causes chronic diarrhea in young cats, often with mucus and blood. It's common in multi-cat environments and can be diagnosed with PCR testing of feces.
Giardia infection
A parasitic infection that causes diarrhea, which can be bloody. Young cats are particularly susceptible, and diagnosis is through fecal testing or PCR.
Inflammatory bowel disease
A chronic condition characterized by inflammation of the gastrointestinal tract, leading to diarrhea and sometimes blood in the stool. Although more common in older cats, it can occur in younger cats as well.
Coccidiosis
An intestinal infection caused by coccidia parasites, leading to diarrhea that can be bloody. It is common in young cats and diagnosed through fecal examination.
Dietary intolerance or allergy
Certain food ingredients can cause gastrointestinal upset, including bloody diarrhea, in sensitive cats. This can be considered if symptoms persist despite treatment for infections.
Easily confused with: Panleukopenia · Campylobacter infection · Salmonella infection · Cryptosporidiosis
Real peer-reviewed cases
Each link below opens the full PetCaseFinder write-up of a published case report. Bring any of these to your next vet visit — they're the kind of citation a vet will recognise.
#1 match
Fulminant Tritrichomonas foetus 'feline genotype' infection in a 3-month old kitten associated with viral co-infection.Veterinary parasitology · 2019 · United Kingdom
A 3-month-old Bengal kitten was diagnosed with a severe infection caused by Tritrichomonas foetus, a type of parasite that can lead to diarrhea in young cats. This kitten had been experiencing vomiting, diarrhea, low energy, and coughing for eight days. Tests showed that the kitten was also infected with two viruses, feline enteric coronavirus and feline panleukopenia virus, which may have weakened its immune system and allowed the parasite to cause such a serious infection. The presence of the parasite was confirmed through testing of the stool. The treatment's effectiveness and the long-term effects of the co-infection will need further study, but the immediate situation was quite serious.
Read the full case →#2 match
What is known about Tritrichomonas foetus infection in cats?Revista brasileira de parasitologia veterinaria = Brazilian journal of veterinary parasitology : Orgao Oficial do Colegio Brasileiro de Parasitologia Veterinaria · 2019 · United States
Tritrichomonas foetus is a parasite that causes a disease in cats known as trichomonosis, which leads to long-lasting diarrhea. This diarrhea can be chronic and may contain mucus and fresh blood, and it often doesn't respond to standard medications. To diagnose this infection, veterinarians can look for the parasite in a stool sample using special tests. While some cats may eventually stop having diarrhea on their own after months or even years, they can still carry the parasite and spread it to others. This paper provides detailed information for veterinarians about the parasite and how to manage the infection in cats.
Read the full case →#3 match
Feline diarrhoea associated with Tritrichomonas cf. foetus and Giardia co-infection in an Australian cattery.Australian veterinary journal · 2008 · United States
A 10-week-old female Ocicat was taken to the vet because she wasn't gaining weight and had diarrhea. Tests showed she had both Giardia (a type of parasite) and another parasite called Tritrichomonas cf. foetus. After treating her for Giardia, her weight and diarrhea improved, but further tests on her and other cats from the same cattery confirmed the presence of Tritrichomonas. This is the first time this particular infection has been reported in cats in Australia, indicating it may be a growing concern. The treatment for Giardia worked, but the presence of Tritrichomonas suggests ongoing health issues that may need further attention.
Read the full case →#4 match
Intestinal Tritrichomonas foetus infection in cats: a retrospective study of 104 cases.Journal of feline medicine and surgery · 2013 · United States
This study looked at 104 cats diagnosed with an intestinal infection caused by a parasite called Tritrichomonas foetus. Most of these cats had diarrhea, which lasted a median of about 135 days, and many had this issue since they were adopted. Other symptoms included not eating well, being very tired, losing weight, vomiting, and some even had abdominal pain. Of the cats that completed treatment with a medication called ronidazole, about 64% showed good improvement, while the rest either didn’t get better or had a relapse after stopping the treatment. Overall, the treatment worked for a little over half of the cats.
Read the full case →#5 match
Simultaneous occurrence of inflammatory bowel disease and trichomonosis in a Maine coon cat.The Canadian veterinary journal = La revue veterinaire canadienne · 2022 · Brazil
A 2-year-old spayed female Maine coon cat was taken to the vet because she was eating less than usual, not growing properly, and had been experiencing severe diarrhea that was bloody and had a bad smell. This diarrhea had started when she was 4 months old and got worse in the days leading up to her vet visit. The vet found that her abdomen was painful and tests showed thickening of her intestines and swollen lymph nodes. A biopsy revealed inflammation in her intestines, and tests confirmed she had both inflammatory bowel disease (a condition causing inflammation in the digestive tract) and trichomonosis (a parasitic infection). She was treated with a special diet, an omega-3 supplement, and medication to reduce inflammation, along with another medication to address the trichomonosis. After 6 months of treatment, she was doing well and appeared healthy at her follow-up visit.
Read the full case →
Your pet's case is probably already published.
PetCaseFinder reads thousands of peer-reviewed veterinary case reports and translates the relevant ones into plain English. Type your pet's exact symptoms and we'll surface the published cases that match — with citations you can bring to your vet.
Run a personalised search →Frequently asked questions
What does Persistent bloody diarrhea in a 6-month-old kitten after ant… usually mean in cats?
Published veterinary case reports most often link this presentation to: Antibiotic-associated colitis, Tritrichomonas foetus infection, Giardia infection. Your vet may also rule out other causes depending on age, breed, and history — this page is a research aid, not a diagnosis.
How many real cases did PetCaseFinder find?
We surfaced 36 peer-reviewed case reports from our library of published veterinary case reports. The top matches are listed above with full citations.
Is this veterinary advice?
No. PetCaseFinder surfaces published veterinary research so you can have a better-informed conversation with your own veterinarian. Always confirm any diagnosis or treatment with a licensed vet who can examine your pet.