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Listeriosis is an often serious infection caused by eating food contaminated with the bacterium Listeria monocytogenes. The disease affects primarily pregnant women, newborns, and adults with weakened immune systems. It can occur sporadically, or in foodborne outbreaks of septicemia (blood poisoning), gastrointestinal (GI) illness, or a combination of both.

In four reported outbreaks of GI listeriosis, the syptom profile was 72% fever, 68% diarrhea, 56 myalgia (muscle ache), 55% headache, 55% abdominal (stomach or intestinal) cramping, 41% nausea and 35% vomiting. A point-source outbreak of GI listeriosis has not occurred in Oregon yet.

Disease Reporting

Health-care providers and clinical laboratories are required to report cases and suspect cases of listeriosis to local health departments within one working day of identification.

Disease reporting form (pdf) for health-care practitioners
See our disease reporting page for information on how to report and for telephone numbers of local health departments.

For county health departments:
Listeriosis surveillance (CDC information)

Listeriosis: Investigative guidelines (pdf) (10/05)
Listeriosis: Case report form (pdf) (2011) ((English)
Listeriosis: Case report form (pdf) (2011) (Spanish)


Listeriosis statstics (pdf) from the 2013 Communicable Disease report

See Also