Yersinia pseudotuberculosis is a Gram-negative bacterium which can infect not only birds but humans and other animals as well. The bacterium is very cold-tolerant and found throughout the environment and wild animals. It has a number of virulence factors which contribute to the pathogenicity of the organism---such as temperature and exposure to an acidic environment.
Y. pseudotuberculosis causes pseudotuberculosis in infected birds, resulting in tuberculosis-like chronic contagious disease and associated symptoms.
Y. pseudotuberculosis is most often transmitted through contamination of the bird's food or water source. The incubation period of Y. pseudotuberculosis is 5-10 days.
Blood samples can be taken and tested to confirm the presence of Y. pseudotuberculosis, but a fecal sample is the preferred method of diagnostic testing. Polymerase Chain Reaction assay can then be used to identify the bacteria and then can further serotype the organism.