Surveillance and Reporting

Psittacosis is a reportable condition in most states. Since 2010, CDC has typically received reports of fewer than 10 confirmed cases in the United States each year. However, experts believe the disease is potentially underreported and underdiagnosed.


Since 1988, there has been a decline in reported psittacosis cases. This decline may be the result of improved diagnostic tests that distinguish Chlamydia psittaci from more common Chlamydia pneumoniae infections.

The number of cases can vary widely from year to year because of periodic outbreaks. For example, poultry processing plants have reported psittacosis outbreaks. Visit the publications page for articles on some outbreaks that involved C. psittaci.

Multistate Psittacosis Outbreak among Poultry Plant Workers, 2018

CDC and the U.S. Department of Agriculture are assisting the Virginia and Georgia departments of health in investigating a multistate outbreak of psittacosis occurring at poultry slaughter plants owned by a single corporation.

Learn more about the outbreak and find information for poultry plant employers and employees.

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Page last reviewed: October 4, 2018