London's Pulse: Medical Officer of Health reports 1848-1972

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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

London County Council 1900

[Report of the Medical Officer of Health for London County Council]

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9
From this it appears, then, that the typhoid bacillus on all materials had been completely
devitalised. It has to be added that in both experiments (a and b), one " paper " on which the
corresponding emulsion of the typhoid bacillus had been allowed to dry, had been kept for control
; this, on subsequent culture in phenol broth, and from this on phenol agar plate, yielded in
24 hours copious growth of the typhoid bacillus, typical in respect of morphology, culture, and
agglutination by typhoid blood.

Table: 2.—Bacillus Diphtheria.The following table X. shows the result of the three experiments, a, bandc,performed with this microbe.

2.—Bacillus Diphtheria.

The following table X. shows the result of the three experiments, a, bandc,performed with this microbe.

Nature of emulsion.Nature of material.Result of culture after exposure.
(a) In brothOn wood—
,,On cloth—
,,On linen—
,,On paper—
(b) In separated milkOn wood—
,,On cloth—
,,On linen—
,,On paper—
(c) As hot gelatine cultureOn wood—
,,On cloth—
,,On linen—
,,On paper—

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Here, also, disinfection was complete on all materials and in all three experiments.

Table: 3.—Bacillus pyocyaneus.Table XI.—Showing the result of exposure to SO2.

3.—Bacillus pyocyaneus.

Table XI.—Showing the result of exposure to SO2.

Nature of emulsion.Nature of material.Result of culture after exposure.
(a) In brothOn wood-
„On cloth-
„On linen-
„On paper-
(6) In separated milkOn wood-
„On cloth-
„On linen-
„On paper-

Table: 4.—Vibrio choleræ.Table XII.—Showing the result of exposure to S02.

4.—Vibrio choleræ.

Table XII.—Showing the result of exposure to S02.

Nature of emulsion.Nature of material.Result of culture after exposure.
(a) In brothOn wood—
„On cloth—
„On linen—
„On paper—
(b) In separated milkOn wood—
„On cloth—
„On linen—
„On paper—
(c) As (hot) gelatine cultureOn wood—
„ „On cloth—
„ „On linen—
„ „On paper—