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HONG KONG.
Notes by Medical Secretary on the Report of the Sanitary
Department, 1922.
18
Rat-catching.
of the total rats caught in Hong Kong (= 76844)
6 only were found to be infected with plague - less than
0.008%, and in Kowloon where 32,452 were caught, 19 were in-
fected less than 0.05%. These are surprisingly low figures
in view of the statement on page 8 of the Medical Report that
1181 cases of plague were certified during the year.
Mosquito prevention. In view of the known presence of
Stegomyia fasciata in Victoria and the Kowloon districts
(see page 15 of Medical Report), and the importance of this
mosquito from its connection with yellow fever in other parta,
steps should be taken to minimise or do away with its breeding
places, wherever possible. Its well known habits as a semi-
domesticated mosquito indicate the lines on which steps should
be taken. Thorough house-to-house inspections at regular
short intervals should be made by Sanitary Inspectors in their
districts to ensure that all receptacles used for the storing of
water are covered and protected from access for the deposition of
egga,
and that eaves-gutters and rain water pipes, etc. shall
not contain residual water in which mosquitoes may breed.
"Mosquito-larvae Indexes", showing the percentage of infected
to uninfected houses should be prepared and issued quarterly
for each district by the Sanitary Inspectors in charge, in
order that an active control may be instituted and maintained.
Action in this respect appears to be possible
under the Bye-law "Prevention of the Dissemination of Disease
by Mosquitoes, of the Public Health and Buildings Ordinance"
(No. 1 of 1903).
Vaccination.
A form of compulsory vaccination is in force.
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