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15
vegetables and shell-fish eaten raw and meat and milk, that
may profitably be taken into consideration. But many of
the persons attacked had not eaten raw vegetables or
shell-fish. Meat is invaribly cooked before it is eaten, and
milk is often boiled. When, however, milk is not boiled
or cooked or heated by admixture with tea or coffee, at a
temperature above 180 degrees Fahrenheit, it possesses
properties singling it out as pre-eminently suited to become
the medium of infection. Milk, then, is the only food that
answers to the description of the article we are seeking:
and consequently milk must be the infecting medium.
Our next object is to trace to its source milk that
had been consumed at the houses scheduled, and I submit
the following list as the preliminary step in that
enquiry.
Case 1 obtains milk from dairy A.
,, 2 ,, ,, B.
,, 3 ,, ,, B.
,, 4 ,, ,, C
,, 5 ,, ,, B.
,, 6 „ „ B.
,, 7 ,, ,, B.
,, 8 ,, ,, D.
,, 9 ,, ,, B.
,, 10 ,, ,, B.
It is apparent that the supply had been obtained from
Dairy B. in 70 per cent of the cases notified, and the
assumption that the infection came also from Dairy B.
follows. Against this assumption, however, are opposed
the following facts:
I. That three cases had not been supplied with milk
from Dairy B.