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Avian Gastric Yeast (Macrorhabdosis)

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Small Pets & Birds

About this condition

A wasting disease caused by the yeast Macrorhabdus (AGY) parasitizing the digestive tract, causing weight loss despite eating. It is prone to relapse, making early detection and ongoing management important.

Common symptoms

  • Vomiting
  • Undigested feces
  • Weight loss despite eating
  • Fluffed feathers

Common causes

  • Macrorhabdus (yeast fungus) infection
  • Stress
  • Decreased immune function

Prevention (husbandry & daily care)

Reduce stress, fecal testing for new birds, maintain hygiene.

Related species guide

Browse the species guide for this animal

When to see a vet

Consider a vet within a few days

What treatment does a vet provide?

A veterinarian will confirm the infection through fecal or gastric fluid testing and administer antifungal treatment. Because relapse is common, regular follow-up testing after treatment is recommended.

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