In June, 1909, a person with amebiasis moved into House 3 on North Johnson Street. The five households in this row all used water from the well between Houses 1 and 2. This is a surface well, about twenty-five feet deep and in no way protected from surface drainage. The privies are all directly back of the houses, on higher ground than the well, at a distance varying from 50 to 150 feet.
On August 16 three people in House 5, three in House 4, and one each in Houses 3, 2 and 1 complained of sore mouth; some of them had diarrhea, some of them only intestinal fermentation without diarrhea. These sore mouths had all developed within the past two weeks and all presented the same appearance—dry red erosions at the angles of the mouth with a dry, brick-red, bald, fissured