An outbreak at a Vancouver restaurant left more than 100 customers with confirmed or probable cases of salmonella, but investigators aren't any closer to knowing the cause.
The Clark County Health Department says lab results from On the Border on Southwest 164th Avenue aren't providing a lot of information.
So far, all the restaurant test results have come back negative for salmonella.
The department says pinpointing an illness is difficult and rare.
Plus, the employees cleaned up before the health inspectors took samples.
The restaurant was forced to shut down for about a week.
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