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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London

Croydon 1935

[Report of the Medical Officer of Health for Croydon]

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Table: The 340 samples of Ordinary Milk contained total bacteria per c.c. as follows:—

The 340 samples of Ordinary Milk contained total bacteria per c.c. as follows:—

0—1,0007
1,000—5,00045
5,000—10,00025
10,000—20,00045
20,000—30,00036
30,000—40,00015
40,000—50,00019
50,000—100,00043
100,000—150,00021
150,000—200,00010
200,000—250,0008
250,000—500,00014
500,000—750,0004
750,000—1,000,0004
1.000,000—2,000,0006
Over 2,000,00038
340

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There is no standard fixed for total bacteria per c. c. in
ordinary commercial milk, but comparing the results with (he
Grade A standard, i.e., 200,000 per c. c., it will be seen that 266
of the samples contained total bacteria in accordance with that
standard. It has to be remembered that a proportion of this milk
has been subjected to commercial pasteurisation.
The 340 samples taken under the Milk and Dairies (Consolidation)
Act, 1915, were samples of milk which had been produced
in the following areas:—

Table: Table XVII.

Table XVII.

Areas.No. obtained.No. Tuberculous.
Croydon797
Kent91
Surrey172
Sussex161
*Unclassified219—
Totals34011

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These samples could not be classified owing to the fact that
it was mixed milk of large dairy firms or wholesale
purveyors of milk, who obtain their milk from practically
all the areas mentioned in the above Table.