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57
and Pathological aspects of the Disease, by Dr. Klein, F.R.S.,and
an Introduction by myself.†
"A 'Provisional Memorandum upon Precautions advisable
at times when Epidemic Influenza threatens, or is prevalent,' was
also drawn up by me in January, 1892, and was issued by the
Board to local sanitary authorities.
"The further study made by the Medical Department as to
the natural history of Influenza, and as to its clinical and bacteriological
characteristics, goes to show that it is a disease against
which it is most difficult to apply measures of prevention with any
substantial prospect of success.
"Influenza is highly infective from person to person; its
infectious quality is often manifested before the disease is fully
recognised; its incubation period is one of the shortest of all
infectious diseases; it varies so much in intensity that many cases
are never diagnosed at all; one attack confers no marked
immunity against another; and the infection is largely eliminated
by means of the lungs, the sputa of the sick being invariably
charged, during the acute stage of the disease, with its pathognomonic
micro-organism. The disease calls primarily for
measures of isolation and of disinfection, but there are difficulties
in making any such measures universally applicable. Wherever
they can be carried out, the following precautions should, however,
be adopted:—
"1st. The sick should be separated from the healthy. This
is especially important in the case of first attacks in a
locality or household.
†Further Report and Papers on Epidemic Influenza, 1889-92, with an introduction by the
Medical Officer of the Local Government Board. [C.—7051], pp. 151—Eyre and Spottiswoode,
East Harding Street, E.C.