Four new North Shore cases bring the total number of confirmed Crypto illnesses in Whitefish Bay, Fox Point and Bayside to 12, in addition to 12 probable cases in which symptoms subsided before they were diagnosed.

Jamie Berg of the North Shore Health Department said the investigation has been definitively narrowed to a pool, lake or river. None of the illnesses has required hospitalization.

Several area pools have closed as a precautionary measure.