106 
Farm of Mrs. 
A most careful investigation was made by the health department of 
the District of Columbia and by ourselves, but no suspicious illness 
could be learned of among those concerned in handling the milk at 
the dairy of dealer No. 59 or at the dairy of dealer No. 11, or at any 
of the farms supplying either of these dealers with milk. All the 
evidence, however, pointed very strongly to the farm of Mrs. X as 
the soiu-ce of the infection, and as there had been no suspicious ill- 
ness on this farm or in the neighborhood thereof to account for the 
infection the possibility of a bacillus carrier being the somce of the 
infection presented itself. 
Specimens of stools and urine from all the thirteen persons on the 
farm were obtained and examined at the Hygienic Laboratory for 
the typhoid bacillus. All were negative except the specimen of 
feces from Mrs. X; this specimen contained a large number of typhoid 
bacilli. 
Mrs. X had had typhoid fever about eighteen years before and 
had been in robust health since then. She had more to do with 
handling the milk on her farm than any of the others there so con- 
cerned. There were a number of ways to accoimt for the infection 
getting into the milk, since infected excreta were being deposited 
in an open privy on the place. Amorig the many possible ways were 
