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Chlamydia psittaci enteric infection in an adult man: A case report

Haohui Deng1, Xiaoting Liang1, Shuyuan Dang1

  • 1Department of Infectious Disease, The Fifth People's Hospital of Shunde District, Foshan City (Longjiang Hospital of Shunde District, Foshan City), Guangdong, China.

International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases
|June 26, 2025
PubMed
Abstract

Insights

This study reports a rare case of Chlamydia psittaci (Cps) causing enteric infection in a man who consumed undercooked pigeon meat. Early diagnosis and treatment are crucial for this zoonotic disease.

Area of Science:

  • Zoonotic diseases
  • Infectious diseases
  • Microbiology

Background:

  • Psittacosis, caused by Chlamydia psittaci (Cps), is a zoonotic disease typically presenting with respiratory symptoms.
  • Infection usually occurs via inhalation of aerosols from infected birds.

Observation:

  • A 62-year-old man presented with fever and severe diarrhea after consuming undercooked pigeon meat.
  • Initial gastroenteritis treatment was ineffective; respiratory symptoms and pulmonary changes developed later.
  • Next-generation sequencing confirmed Cps DNA in patient samples and source pigeons.

Findings:

  • Chlamydia psittaci (Cps) was identified as the cause of enteric infection in this patient.
  • The ompA genotype A was consistent between the patient and the pigeons.
  • Treatment with levofloxacin and doxycycline successfully resolved symptoms and improved pulmonary findings.

Implications:

  • This case underscores Cps's potential to cause enteric illness, not just respiratory disease.
  • Clinicians should consider psittacosis in patients with fever and diarrhea, especially with relevant exposure history.
  • Prompt diagnosis and treatment are vital to prevent severe outcomes of this zoonotic infection.
Keywords:
Chlamydia psittaciEarly diagnosisEnteric infection

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