Abstract
Here, we aimed to retrospectively analyze the clinical characteristics of 27 patients with severe pneumonia caused by Chlamydia psittaci between January 2019 and April 2021 in southwest China. To this end, we collected data on the exposure history, clinical symptoms, laboratory examination, imaging characteristics, evolution, etiology, treatment, and outcomes to suggest a better diagnosis and prevention system. Our results showed that a metagenomic next-generation sequencing test could provide early diagnosis. All patients were sensitive to quinolones and tetracyclines, and the recovery rate was relatively high. Overall, all patients were in critical condition with moderate to severe acute respiratory distress syndrome and shock. In conclusion, early diagnosis of pneumonia caused by C. psittaci depends on effective molecular testing, and most patients recover after treatment.
Highlights
Chlamydia psittaci is a gram-negative bacterium with a size between bacteria and viruses
Nearly 63.7% of patients with C. psittaci infection are male (Yung and Grayson, 1988), which was in agreement with the rate in our study (69% male).The majority of infections reported in previous studies were in adults between the ages of 30 and 60 years (Shi et al, 2021), as was the case in our cohort
In a previously reported case of encephalopathy (Walder et al, 2003), C. psittaci was found in the cerebrospinal fluid of the patient, which may show that the first mechanism is the most possible
Summary
Chlamydia psittaci is a gram-negative bacterium with a size between bacteria and viruses. It widely exists in wild birds or poultry such as parrots, wild pigeons, chickens, and ducks. Humans are usually infected by inhaling the organisms in dry feces or bird feather dust when caged birds spread their wings. Mouth to beak contact, and even brief contact, such as visiting bird parks, are related to the spread of this infection (Hinton et al, 1993). C. psittaci pneumonia has been recognized worldwide, including in the United States, United Kingdom, Europe, Middle East, and Australia, and was previously thought to cause 1% of the cases of community-acquired
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