Surveillance and Reporting

Psittacosis is a reportable condition in most states. Since 2010, CDC has typically received reports of fewer than 10 cases in the United States each year. However, experts believe the disease is potentially underreported and underdiagnosed. In 2018, a multistate psittacosis outbreak among poultry plant workers had 13 laboratory confirmed cases.


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 C. 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.

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Page last reviewed: August 22, 2019