47 
and under practically similar conditions but obtaining milk from 
other sources. 
There Avere several instances of two or more cases in the same 
famil}" with onsets on the same day. About 200 families obtained 
milk from this dairy, and estimating the number of persons in a 
family at 5, there Avere about 1,000 persons exposed to this milk 
infection. The histories obtained as to the ways in which milk Avas 
used by the 28 cases during the thirty days prior to the onset of 
illness were as follows : 
' Cases. 
As a beA^erage 20 
On fruits and cereals, but not as a beverage 0 
In tea or coffee only 2 
Total - 28 
The ages of the cases Avere as follows : 
Years : Cases. 
0-4 4 
5-0 _ 
10-14 
15-10 
20-24 
25-20 4 
3a-84 2 
40-14 1 
Total 28 
There Avere six instances in Avhich the person affected Avas the only 
member of the family who used milk freely as a beA^erage, the other 
members using it chiefly in fruits, cereals, and coffee. On the other 
hand, and showing hoAv misleading the exceptional case may be, 
there was one instance of three children in a family all of whom used 
milk as a beAxrage, but the child Avho drank milk in smallest quantity 
Avas the one affected. 
In another famih^ there were three children, aged about 2, 4, and 6 
years, all of Avhoni used milk as a beverage. For the youngest child 
the milk Avas sterilized. This child remained Avell, Avhile the tAA o avIio 
drank the raAV milk had typhoid fever, being stricken on about 
the same date. 
The dairy Avas supplied Avith milk b}^ Iaao dairy farms. At 
the beginning of the outbreak one of these farms Avas inspected by 
representatAes of the health office. Xo typhoid feATr cases Avere 
found on this farm ; but on account of general conditions the sale of 
milk from it in the District of Columbia was discontinued by order 
of the health officer on July 10. 
The outbreak continued after an interval more than coA'ering the. 
usual incubation period of typhoid fever (in cases of milk infection) 
had elapsed after the discontinuance of milk from this farm. So it 
