On 13 November 2019, a public health unit in Sydney, Australia was notified of two unrelated patients who presented on the previous day to different emergency departments (EDs) with methaemoglobinaemia.1 Both had sudden symptom onset after dining at the same restaurant, raising suspicion that these presentations were linked to contaminated food, and prompting investigation. Foodborne illness in two or more related cases is notifiable under the Public Health Act 2010 (NSW).2
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We thank Keira Glasgow, Manager of Enteric and Zoonotic Diseases with the Enterics, Zoonoses and Multi‐Resistant Organisms Branch at NSW Health, for her input during the investigation.
No relevant disclosures.