We usually see in the news “restaurant XXX causes 15 patrons to fall sick”. Assuming most of the customers don’t know each other nor have means to contact each other. Who’s asking the patients where they ate and who’s making the connection?
I ask because for all the times I’ve had food poisoning in my life, I’ve never been asked by the doctor where I ate.
In: 5
This boils down to your country’s/state’s department of health. They will find clusters of infection as reported by local Healthcare workers.
As an example: 15 people go to the er with nausea and vomiting. The pattern emerges over a few hours. Doctors begin asking questions about patient environments and habits to rule out public health hazards. If 13 of the 15 say they ate at restaurant X then the local health authorities are alerted and investigate.
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