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Background   Listeria monocytogenes  infection is most commonly recognized in ruminants, including cattle, sheep, and goats; but it is rarely diagnosed in poultry. This report describes an outbreak of  L. monocytogenes  in a backyard poultry flock. Also, it points out the importance of collaboration between veterinarians and public health departments and the possible implications of zoonotic diseases.    Case presentation  Depression, lack of appetite, labored breathing, and increased mortality were noted for 5 months in several affected birds within the flock. The pathologic changes in the internal organs of infected birds included severe myocarditis, pericarditis, pneumonia, hepatitis, and splenitis. No lesions were noted in the brain. Gram-positive organisms were seen in histologic sections of the heart and spleen.  Listeria monocytogenes  was detected by real time PCR from formalin fixed heart and spleen, and was isolated from fresh lung, spleen, and liver. This isolate was identified as  L. monocytogenes  serotype 4b by 16S rDNA sequencing and by PCR-based serotyping assay.    Conclusions  This is the first report describing outbreak of  L. monocytogenes  in backyard poultry flock in Washington State and use of molecular methods to confirm  L. monocytogenes  infection from formalin fixed tissues.

Outbreak of Listeria monocytogenes in an urban poultry flock