What to Expect During an Illness Investigation
As mentioned above, the Snohomish County Health Department receives foodborne illness notifications and complaints from the public. But what does that mean for the establishment that is suspected of causing the illness? Once we have gathered more information from that notification, we determine if the illness is something that could have been caused by a food service establishment. We also keep track of all the notifications to see if there is a pattern. If we get several notifications for the same establishment or several notifications for different establishments, but the symptoms or foods that are brought up are the same, we may start an illness investigation.
The illness investigation usually involves multiple inspectors who both inspect for the illness and perform a routine inspection. They will be looking for contributing factors that might have led to the illness reported. If they suspect a food, they might take samples of it to send to labs for testing. They will create food flows, which help them answer questions like:
- What is the process for making that food from receiving to serving?
- Who made what, when, and where?
- Where do the food products come from?
The inspectors will request documentation from the person in charge (PIC). This can include illness logs, shift schedules, delivery invoices, recipes, and potentially customer information.
This illness investigation may take place during one visit, but often multiple visits are required to fully address the outbreak as more information is received from the public or even lab testing. If contributing factors can be identified, the inspector will recommend or require certain control factors. This might include restricting or excluding food workers, modifying procedures, requiring training, cleaning, sanitizing, or closure. Foodborne illness data is reported annually to the Washington State Department of Health and the CDC. This data is used to understand how and why the outbreak occurred and to aid in future prevention of foodborne illness outbreaks.