Researchers have stressed the need for awareness of long incubation periods as part of an investigation into a Salmonella outbreak in Norway in 2017.

In September 2017, a cluster of monophasic Salmonella Typhimurium isolates was identified at the National Reference Laboratory for Enteropathogenic Bacteria in Norway. The dispersion of cases around Norway initially suggested an outbreak linked to a nationally distributed product, according to the study published in the journal Eurosurveillance.

Incubation periods ranged from zero to 16 days and increased as the outbreak progressed, likely due to increasingly low-dose exposure as control measures were implemented. The incubation period
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