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Vent gleet is a wet, messy and inflamed vent in a laying hen; the Merck Veterinary Manual uses the name for diuresis syndrome, also called urate vent scalding, a poorly understood condition linked to heat and humidity rather than a simple yeast infection. Several other problems can look similar, so the right treatment depends on a veterinarian’s diagnosis. This guide explains what is known about the cause, the signs to watch for and what you can do.
Key Takeaways
- Vent gleet is another name for diuresis syndrome (urate vent scalding) in laying hens.
- It increases in spring and summer with heat and humidity and is usually seen from the start of lay, most often in heavier hens with feathering problems.
- Candida yeast mainly affects the crop, mouth and esophagus, and it also lives in healthy birds, so vent gleet should not be assumed to be a yeast infection.
- No antifungal drug is FDA-approved for chickens in the US; any medication needs a veterinarian and an egg withdrawal time.
- A soiled vent can attract pecking, and the condition is linked to peritonitis and salpingitis.
Correction: an earlier version of this article described vent gleet as a Candida yeast infection of the cloaca, recommended antifungal drugs such as fluconazole and ketoconazole without a veterinarian, and promoted apple cider vinegar washes and herbal supplements as cures without evidence.
What vent gleet is
Vent gleet is a descriptive term for a vent that is constantly wet, soiled and inflamed. Merck lists it as another name for diuresis syndrome or urate vent scalding, a condition of laying hens that it describes as poorly understood and difficult to solve.
In affected hens, the kidneys pass excessive amounts of sodium and potassium urates (the white part of droppings). The constant wet urates soil and scald the feathers and skin around the vent.
Signs to look for
- Wet, matted, dirty feathers below the vent
- Red, irritated skin around the vent
- Excess white, pasty or watery urates in droppings
- Panting, which Merck links to the acid-base changes seen in affected hens
- Other hens pecking at the soiled area
A dirty vent can also be caused by other problems, including diarrhea from gut disease, a prolapse or reproductive tract infections. See our guides to prolapsed vent and egg yolk peritonitis. This is why a veterinary exam matters before treating.
What causes it
The exact cause is not fully understood. According to Merck:
- Heat and humidity. The condition is seasonal, increasing in spring and summer.
- Start of lay. It is typically seen from the onset of egg production.
- Heavier hens with feathering issues are usually more affected.
- Diet and metabolism. Affected hens appear to struggle with acid-base balance while eating the protein, energy and minerals needed for egg production.
Is vent gleet a yeast infection?
Many hobby sources call vent gleet a Candida infection, but that is not supported by veterinary references. In poultry, Candida (candidiasis) lesions are most often found in the crop, and sometimes the mouth and esophagus. It usually follows antibiotic treatment or dirty waterers, and heavy parasite loads and vitamin A deficiency also raise the risk. For crop problems, see our guide to sour crop.
Candida is also a normal resident of the gut in healthy poultry, so a positive swab or culture alone does not prove it is the cause of a problem. A veterinarian needs to look at the whole picture.
Treatment: what you can and cannot do
There is no single proven cure for vent gleet. Practical steps while you arrange a vet visit:
- Separate the hen if others are pecking at her vent, since diuresis syndrome can lead to cannibalism.
- Keep her in a clean, dry, well-ventilated space, out of the heat.
- Contact a veterinarian who treats poultry to confirm the cause and rule out prolapse, peritonitis or infection.
Medications need a veterinarian
No products are approved to treat candidiasis in poultry in the US. If a vet confirms a yeast problem, they may prescribe an antifungal such as nystatin under extra-label rules and tell you how long to discard eggs. Do not use human antifungals such as fluconazole or ketoconazole on your own.
If a vet finds a bacterial infection, remember that since June 2023 medically important antibiotics for chickens require a veterinarian’s prescription in the US. Home remedies such as apple cider vinegar washes, oregano oil or garlic have no documented effect on vent gleet.
Prevention
Merck’s prevention points are aimed at commercial flocks, but the principles apply to backyard hens:
- Keep the coop cool and well ventilated in hot, humid weather.
- Raise pullets to a good, even size before they start laying.
- Feed a complete layer ration that meets hens’ needs for calcium, phosphorus and potassium, rather than a diet heavy in treats.
- Keep waterers clean, which also reduces the risk of crop candidiasis.
- Check vents regularly so you can separate a soiled hen before pecking starts.
FAQs
Is vent gleet contagious?
Merck describes vent gleet (diuresis syndrome) as a condition of laying hens linked to heat, humidity and metabolism, not as an infectious disease. Because other, infectious problems can look similar, ask a vet if several hens are affected.
Can I treat vent gleet with apple cider vinegar?
There is no evidence that apple cider vinegar washes or drinking-water additives treat vent gleet. Focus on a clean, cool environment and a veterinary diagnosis.
Can I eat eggs from a hen with vent gleet?
If the hen is on any medication, follow the egg withdrawal time your veterinarian gives you. Drugs not labeled for chickens require a vet-set withdrawal period.
Can vent gleet kill a chicken?
It can lead to serious problems. Merck notes diuresis syndrome can lead to cannibalism, peritonitis and salpingitis, so a hen that is lethargic, off her feed or being pecked needs prompt attention.
Conclusion
Vent gleet is best understood as urate vent scalding in laying hens, not a simple yeast infection. Keep affected hens cool, clean and protected from pecking, and let a veterinarian decide whether any medication is needed.
Sources
- Merck Veterinary Manual: Diuresis Syndrome in Poultry
- Merck Veterinary Manual: Candidiasis in Poultry
- FDA: The Ins and Outs of Extra-Label Drug Use in Animals
- FDA: GFI #263 Frequently Asked Questions for Farmers and Ranchers
- University of Maryland Extension: My chicken is sick. What do I do?
Checked September 2026. Labels change, so always read the label on the product you buy. See our editorial policy for how we research health articles.
