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Changes in the tests that diagnose foodborne illness are helping identify infections faster but could soon pose challenges to finding outbreaks and monitoring progress toward preventing foodborne disease, according to a report published today in CDC?s Morbidity and Mortality Week Report.
Culture-independent diagnostic tests (CIDTs) help doctors diagnose infections quickly because they provide results in hours instead of the days needed for traditional culture methods, which require growing bacteria to determine the cause of illness. But without a bacterial culture, public health officials cannot get the detailed information about the bacteria needed to help find outbreaks, check for antibiotic resistance, and track foodborne disease trends.
In 2015, the percentage of foodborne infections diagnosed only by CIDT was about double compared with the percentage in 2012-2014.
Foodborne infections continue to be an important public health problem in the United States,said Robert Tauxe, M.D., M.P.H, director of CDC's Division of Foodborne, Waterborne and Environmental Diseases. We are working with partners to make sure we still get important information about harmful bacteria despite the increasing use of diagnostic tests that don't require a culture.
The increased use of CIDT could affect public health officials ability to monitor trends and detect outbreaks. In the short term, clinical laboratories should work with their public health laboratories to make sure a culture is done whenever a CIDT indicates that someone with diarrheal illness has a bacterial infection. For a long-term solution, CDC is working with partners to develop advanced testing methods that, without culture, will give health care providers information to diagnose illness and also give the detailed information that public health officials need to detect and investigate outbreaks.Limited progress in reducing foodborne illness.
The report included the most recent data from CDC?s Foodborne Diseases Active Surveillance Network, or FoodNet. It summarizes preliminary 2015 data on nine germs spread commonly through food. Overall, progress in reducing rates of foodborne illnesses has been limited since 2012, according to the report. The most frequent causes of infection in 2015 were Salmonella and Campylobacter, which is consistent with previous years.Other key findings from the FoodNet report include: