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Vetdle Archive

Archive Case #39: Avian Chlamydiosis

Bird veterinary case - Medium - April 11, 2026

Clinical Clues

  1. A companion parrot is presented for lethargy, poor appetite, and intermittent green droppings.
  2. The owner has also noticed mild ocular discharge and sneezing over the past week.
  3. The bird is fluffed up, quiet, and has lost body condition.
  4. Examination reveals conjunctivitis and signs of respiratory involvement without a focal oral lesion.
  5. Choanal and cloacal testing supports infection with Chlamydia psittaci.
  6. This important zoonotic disease of birds can cause systemic illness with respiratory, ocular, and gastrointestinal signs.

Diagnosis

Avian Chlamydiosis

This case is most consistent with Avian Chlamydiosis because the bird has a multisystem illness involving the eyes, respiratory tract, and droppings with testing supportive of Chlamydia psittaci. The most important clues are the conjunctivitis, green droppings, and zoonotic respiratory picture, which make a simple local upper airway problem less likely.

Learning review

Review the case evidence

Use the paired clues to explain how the evidence in this bird case supports the provided diagnosis, Avian Chlamydiosis, then compare your reasoning with the case explanation.

Evidence checkpoints

Clues 1-2

  1. Clue 1: A companion parrot is presented for lethargy, poor appetite, and intermittent green droppings.
  2. Clue 2: The owner has also noticed mild ocular discharge and sneezing over the past week.

Clues 3-4

  1. Clue 3: The bird is fluffed up, quiet, and has lost body condition.
  2. Clue 4: Examination reveals conjunctivitis and signs of respiratory involvement without a focal oral lesion.

Clues 5-6

  1. Clue 5: Choanal and cloacal testing supports infection with Chlamydia psittaci.
  2. Clue 6: This important zoonotic disease of birds can cause systemic illness with respiratory, ocular, and gastrointestinal signs.

Self-review prompts

  1. After clues 1-2, what evidence from this bird case shaped your initial interpretation?
  2. When you compare clues 3-4 with clues 1-2, what changed in your reasoning about Avian Chlamydiosis?
  3. How do clues 5-6 align with the case explanation for Avian Chlamydiosis?

Educational Use

Vetdle archive cases are educational veterinary games for diagnostic reasoning practice. They do not provide veterinary advice, diagnosis, treatment, or professional medical guidance.