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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 1925

[Report of the Medical Officer of Health for Croydon]

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Table: The following table summarises the results of the bacteriological examination of ordinary milk samples taken under the Croydon Corporation Act, 1900, from 1st January to 31st December, 1925 : —

The following table summarises the results of the bacteriological examination of ordinary milk samples taken under the Croydon Corporation Act, 1900, from 1st January to 31st December, 1925 : —

ORDINARY MILK.Present.Absent.Over 200,000 per c.c.Under 200,000 per c.c.Present in 100 c.c.Absent from 100 c.c.Present.Absent.Present.Absent.Exceeding a trace.Not exceeding a trace.
Tubercle bacillus198
Total No. of bacteria1287
Bacillus Coli3267
Blood...99
Pus...99
Detritus...99
999999999999

Table: The above 99 samples of ordinary milk contained total bacteria per c.c. as follows :—

The above 99 samples of ordinary milk contained total bacteria per c.c. as follows :—

1,000 —5,0001
5,000 —10,0006
10,000 —20,00021
20,000 —30,00026
30,000 —40,0004
40,000 —50,0004
50,000 —100,00011
100,000 —150,0005
150,000 —200,0009
200,000 —250,0003
250,000 —750,0008
750,000 —1,000,0001
.99

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There is no standard fixed for total bacteria per cc. in ordinary
commercial milk, but comparing the results with the Grade A
standard, i.e., 200,000 per cc., it will be seen that 87 of the samples
contained total bacteria below that standard. It has to be remembered
that a large proportion of this milk has been subjected to
commercial pasteurisation.