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In recent months, global cases of shigellosis have been on the rise.

In previous years, shigellosis mostly affected people who were housed — and in an average December, typically two or three cases a week.

In 2018, shigellosis cases increased another 67% as the result of two major outbreaks linked to food service and an elementary school.

Then there were all the diseases one is vulnerable to in the woods—giardiasis, eastern equine encephalitis, Rocky Mountain spotted fever, Lyme disease, ehrlichiosis, schistosomiasis, brucellosis, and shigellosis, to offer but a sampling.

In his area, Duchin said, he has seen shigellosis, trench fever and skin infections among homeless populations.