118 TYPHOID FEVER IX DISTRICT OF COLUMBIA. 
The following case of t^^hoid fever drank the water of this well: 
Case 
No. 
Onset of 
disease. 
During the 3 Odays preceding onset of disease used the weU water — 
Probable source of 
infection. 
464 
July 25 
Frequently 
9 
4 
No. 18. 
Location. — Seventh and M streets NAY. (southeast corner). 
Kind. — Iron. 
Condition. — Old; pipe drain to sewer. 
Depth. — Deep; below surface, 151 feet; water, 54 feet. 
Sewer. — Depth, 7 feet; distance from well, 15 feet. 
Privies. — One within one and one-half blocks. 
Bacteriologically . — Good. 
Chemically. — Unpolluted. 
The following 2 cases of t;\’phoid fever drank the water of this well: 
Case 
No. 
Onset of 
disease. 
During the 30 days preceding onset of disease used the well water — 
Probable source of 
infection. 
636 
Aug. 12 
Sept. 25 
Occasionally. .. ... 
9 
911 
Frequently 
9 
Xo. 21. 
Location. — O street, between Sixth and Seventh XW. (north side, mid-block). 
Kind. — Iron. 
Condition. — Old; badly rotten, middle third; pipe drain to sewer. 
Depth. — Deep; below smlace, 201 feet; water, 35 feet. 
Sewer. — Depth, 10 feet; distance from well, 60 feet. 
Privies. — Nearest, one and one-half blocks. 
Bacteriologically. — Good. 
Chemically. — Unpolluted. 
No. 71. 
4 
Ljocation. — Pennsyh^ania avenue and I street, between Twentieth and Twenty-first 
streets NAY. (south side). 
Kind. — Iron. 
Condition. — Old; rotten; split; pipe drain to sewer. 
Depth. — Deep; below smlace, 203^ feet; water, 35 feet. 
Sewer. — Depth, 8 feet; distance from well, 100 feet. 
Privies. — Nearest, one and one-half blocks. 
Bacteriologically. — Presence of an occasional colon bacillus, probably indicating con- 
tamination from the surface. Pump should be repaired. 
Chemically. — Unpolluted . 
The following 2 cases of t^’phoid fever drank the water of this well: 
Case 
No. 
Onset of 
disease. 
During the 30 days preceding onset of disease used the well M’ater — 
Probable source of 
infection. 
471 
July 30 
Aug. 4 
Occasionally 
Contact. 
697 
Frequently 
9 
