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In late July of 2011, Reuters published an article on the Arizona Department of Health Services reporting of a cluster of 24 cases of GBS in Yuma County. It is located in far western Arizona and neighboring San Luis Rio Colorado, in Mexico’s northern Sonora state.
Even though an earlier article on msnbc.com had reported it was likely to be food poisoning, a later article from Food Safety News associated the outbreak to the local water supply. It’s unclear at this point whether the water had contributed to the outbreak.