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Hessarek is an uncommon serotype in Australia. We report on the investigation of a protracted outbreak of 25 cases of  Hessarek gastroenteritis in which cases were defined as any laboratory confirmed case of  Hessarek notified to the South Australian Communicable Disease Control Branch from 1st March 2017 to 3 July 2018. We conducted a descriptive case series investigation interviewing all cases and 17 (68%) reported consuming brand X free-range eggs. Four samples of one-dozen brand X eggs were cultured for the presence of  spp. One out of the four samples returned positive for  Hessarek in the contents of the eggs;  was not present in any of the whole egg rinses of the four samples. The high proportion of cases reporting the consumption of brand X free-range eggs and the isolation of  Hessarek from sampling four dozen brand X eggs is an unusually strong signal implicating brand X eggs as the source of this outbreak. From a public health perspective, it is important to understand the behaviour of  Hessarek including its ability to be present in the content of eggs and further research is recommended. The findings in this investigation into a rare  serotype highlight the need for continuous monitoring of the epidemiology of  in Australia including the epidemiology of egg-associated  outbreaks of human disease.

A protracted outbreak of Salmonella Hessarek infection associated with one brand of eggs—South Australia, March 2017 - July 2018