Multistate Outbreak of <i>Salmonella enterica</i> Serovar Heidelberg with Unidentified Source, Australia, 2018–2019

Abstract

S almonella enterica serovar Heidelberg is a fre- quently identifi ed serotype among infections in humans in North America, East Africa, and Asia but is uncommon in Australia. An average of 37 cases of Salmonella Heidelberg were notifi ed in Australia annually in 2009-2017, predominantly overseas acquired (1). Six outbreaks have been reported nationally since 1995; 1 outbreak in 1996 had >500 cases, but most have <7 cases (R. Bell, pers. comm. [email], 2020 Jun 16). We report a national outbreak of Salmonella Heidelberg infection across 5 jurisdictions over 7 months.