The most serious heath concern caused by the poor sanitation and contaminated water supplies in 19th century tenements is cholera epidemic.
Cholera is a disease caused by bacteria, vibrio cholarea. The bacteria is present in water.
The symptoms of this disease are diarrhea and dehydration.
Thus, the most serious heath concern caused by the poor sanitation and contaminated water supplies in 19th century tenements is cholera epidemic.
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