Abstract:
:Whole apples have not been previously implicated in outbreaks of foodborne bacterial illness. We investigated a nationwide listeriosis outbreak associated with caramel apples. We defined an outbreak-associated case as an infection with one or both of two outbreak strains of Listeria monocytogenes highly related by whole-genome multilocus sequence typing (wgMLST) from 1 October 2014 to 1 February 2015. Single-interviewer open-ended interviews identified the source. Outbreak-associated cases were compared with non-outbreak-associated cases and traceback and environmental investigations were performed. We identified 35 outbreak-associated cases in 12 states; 34 (97%) were hospitalized and seven (20%) died. Outbreak-associated ill persons were more likely to have eaten commercially produced, prepackaged caramel apples (odds ratio 326·7, 95% confidence interval 32·2-3314). Environmental samples from the grower's packing facility and distribution-chain whole apples yielded isolates highly related to outbreak isolates by wgMLST. This outbreak highlights the importance of minimizing produce contamination with L. monocytogenes. Investigators should perform single-interviewer open-ended interviews when a food is not readily identified.
journal_name
Epidemiol Infectjournal_title
Epidemiology and infectionauthors
Angelo KM,Conrad AR,Saupe A,Dragoo H,West N,Sorenson A,Barnes A,Doyle M,Beal J,Jackson KA,Stroika S,Tarr C,Kucerova Z,Lance S,Gould LH,Wise M,Jackson BRdoi
10.1017/S0950268816003083subject
Has Abstractpub_date
2017-04-01 00:00:00pages
848-856issue
5eissn
0950-2688issn
1469-4409pii
S0950268816003083journal_volume
145pub_type
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