Persistence of Chlamydia psittaci in Various Temperatures and Times

Area of Science:

• Veterinary Microbiology
• Zoonotic Diseases
• Bacterial Pathogenesis

Background:

• Chlamydia psittaci is an obligate intracellular bacterium responsible for psittacosis, a significant zoonotic disease.
• Pigeons are known reservoirs for Chlamydia psittaci, posing a risk for transmission to humans.
• Understanding the environmental persistence of Chlamydia psittaci is crucial for disease control.

Purpose of the Study:

• To investigate the viability and persistence of a Chlamydia psittaci field strain under various temperature conditions.
• To determine the survival rate of Chlamydia psittaci in pigeon samples at elevated temperatures.
• To assess the public health implications of Chlamydia psittaci survival in tropical environments.

Main Methods:

• Collection of cloacal swab samples from feral and racing pigeons in central Thailand.
• Polymerase Chain Reaction (PCR) for bacterial detection and identification.
• Bacterial characterization to determine genotype and quantify titers (log 50% lethal dose/ml).
• Persistence testing of Chlamydia psittaci at 56°C for up to 72 hours.

Main Results:

• Chlamydia psittaci was detected in 1.3% of feral pigeons; racing pigeons tested negative.
• The isolated strain belonged to genotype B with high bacterial titers.
• Chlamydia psittaci demonstrated remarkable survival, remaining viable and infectious at 56°C for 72 hours.

Conclusions:

• Feral pigeons in central Thailand harbor Chlamydia psittaci genotype B.
• The bacteria's ability to survive high temperatures highlights its adaptability to equatorial climates.
• This study underscores the need for increased awareness and public health vigilance regarding Chlamydia psittaci infections.