Health officials still have no explanation for what may have sickened hundreds of customers at a Chipotle Mexican Grill in Central Ohio last month.
The Delaware General Health District said tests by the Ohio Department of Health of leftover food from the Powell restaurant found no evidence of salmonella, shigella, E. coli or other forms of bacteria.
Stool samples provided by affected customers also initially failed to turn up any evidence of bacteria or norovirus. Officials have sent samples for…
