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Urinary tract infections (UTIs) are common and may occur in foodborne Salmonella outbreaks. Using data from PulseNet, the U.S. national molecular subtyping network for foodborne disease surveillance, we analyzed the 9781 Salmonella isolates associated with the 110 outbreaks from 2004 to 2013 that included at least one urine isolate. Within each outbreak, we calculated standardized isolation dates, using these dates in a linear mixed model to estimate the difference in incubation period for infections yielding stool versus urine isolates. We estimate that the incubation period for Salmonella UTIs is on average 10.6 (95% confidence interval 6.0-15.2) days longer than for gastrointestinal illness, suggesting that outbreak investigators should interview UTI patients about a longer time period before illness onset to identify sources of infection.

Estimating the Incubation Period of Salmonella Urinary Tract Infections Using Foodborne Outbreak Data