Whole genome sequencing of bacteria from 1,012 people’s samples did not predict any antibiotic resistance. DNA fingerprinting is performed on bacteria using a method called whole genome sequencing (WGS). CDC PulseNet manages a national database of DNA fingerprints of bacteria that cause foodborne illnesses. Public health investigators used the PulseNet system to identify illnesses that were part of this outbreak. Of 407 people with information, 294 (72%) reported eating or maybe eating raw onions or dishes likely containing raw onion before they became sick. State and local public health officials interviewed people about the foods they ate in the week before they got sick. In addition, recent illnesses may not yet be reported as it usually takes 3 to 4 weeks to determine if a sick person is part of an outbreak. This is because many people recover without medical care and are not tested for Salmonella.
The true number of sick people in an outbreak is likely much higher than the number reported, and the outbreak may not be limited to the states with known illnesses. Of 778 people with information available, 260 (33%) were hospitalized.
Sick people ranged in age from less than 1 year to 101 years, with a median age of 38, and 58% were female. Illnesses started on dates ranging from May 31, 2021, to Janu( see timeline). Epidemiologic DataĪs of January 20, 2022, a total of 1,040 people infected with the outbreak strain of Salmonella Oranienburg were reported from 39 states, the District of Columbia, and Puerto Rico ( see map). CDC, FDA, and public health and regulatory officials in several states collected different types of data to investigate a multistate outbreak of Salmonella Oranienburg infections linked to onions.Įpidemiologic and traceback data showed that this outbreak of Salmonella Oranienburg infections was linked to whole, fresh onions imported from the State of Chihuahua, Mexico.Īs of February 2, 2022, this outbreak is over.
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