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The Delaware Public Health Laboratory (DPHL) provides testing to assist in identification of foodborne illness outbreaks.
DPHL supports other state partners when investigating tainted foods or suspected food-borne outbreaks. Infectious disease epidemiologists and the Office of Food Protection Health Systems Protection (HSP) can refer cases to DPHL for testing. Using symptoms and adverse reactions attributed to consuming suspected food, Epi and HSP guide DPHL in determining the appropriate method for detecting the food borne pathogen. Target organism(s) must be specified on the Request for Non-Clinical Preparedness Testing form and the Chain of Custody form must be completed at the time of delivery to the lab.
Standard procedures for processing food are more complicated than handling routine specimens. Foods cannot be screened for numerous pathogens due to the nature of the testing. Target organisms must be identified so that the food can be enriched specifically for that organism. Special media is required for fastidious organisms, usually found in mixed flora. Communication with the laboratory prior to delivery of the specimen(s) is a requirement.
Currently there are no successfully validated methods for detection of Norovirus in foods. If Norovirus infection is suspected, stool samples can be tested from suspected food handlers, or those persons suspected of being infected. Stools should be collected in sterile leak proof containers with 2 unique identifiers and submitted to the laboratory as soon as possible with completed Test Requisition Form. Requests for Norovirus testing must be approved and coordinated through the Office of Infectious Disease Epidemiology (OIDE).
The Delaware Public Health laboratory does not maintain the capabilities to analyze food for the presence of the Clostridium bacterium or its toxins (e.g., C. botulinum). These services are available at select food testing laboratories, as well as the FDA and CDC. Contact Office of Infectious Disease Epidemiology to determine need for antitoxin or if further testing is warranted. CDC Hotline can be contacted directly at (404) 639-3311.
Foods are blended and inoculated onto the appropriate selective media, incubated, and examined by lab personnel. Subcultures are performed if indicated. Organisms are confirmed with biochemical tests.
Reports are sent to the epidemiologist and environmental health specialist handling the investigation.
Turnaround times vary according to the organism being sought and range from 3 - 7 days.
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This page was last updated 3/24
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