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Tabic III shows two further samples (7 and 82).
Sample 7 is the same as sample 8, except that sample 8 was taken from the receiver of the
pasteurising plant, and 7 from the churn into which the milk was immediately afterwards
received. Sample 32 was taken immediately after pasteurisation. It shows the same defect
re the presence of gross contamination with saprophytic organisms, and the sterilisation was
not perfect.
Specimens 8, 14, 23, 32 were all from different dairies.
The defect in the process whereby gross contamination with saprophytic organisms has
occurred is dangerous not only from the changes that can be set up in milk by their presence,
but it means that there is a defect which may on occasion allow more dangerous organisms to
gain access to the milk.
Cowshed, milk obtained locally.
The milk from these sources showed very little contamination re intestinal organisms
but the utensils were either very improperly cleansed or the milk was subjected to some
exposure whereby it had become grossly contaminated with saprophytic organisms.
Changes occurring in milk that can be traced from wholesale dairies to the retailers.
Table Y gives the figures.
Here it will be seen that there is a great multiplication of both fecal and saprophytic
organisms.
Table VI follows two specimens of milk from the railway depot through the process of
pasteurisation to the time of being retailed.
Here the pasteurisation was very inefficient, then subsequently there was a great
multiplication of all types of bacteria.
Milk obtained from the retailers.
No appreciable difference can be detected in the bacteriological purity of specimens
obtained from dairy shops, general shops or from street vendors.
The specimens on the whole show an increase in bacterial contamination when compared
with the series of specimens as they arrive at the depots.
There is also a great increase in the heaviness of the saprophytic contamination.
Tubercle bacilli of bovine origin were found in only one specimen of the 24, making
4 per cent.
No other pathogenic bacteria were found.
Among the anaerobic organism found were B. Welchii, Vibrion septique, B. sporogenes.
From the examination of the specimens as a whole:—
(1) Bovine tubercle bacilli were found in three specimens out of 50, making 6 percent.
(2) Pathogenic bacteria besides the above were seen in only one case and the
organism isolated was B. paratyphosus B.
(3) Excremental organisms were present in large numbers in the majority of the
specimens.
(4) Saprophytic organisms were also present in large amount.