M 63-
B. Annual Report of the Malaria Bureau, 1938.
327. Dr. R. B. Jackson, O.B.E. left the Colony prior to retirement on 13th September, and Dr. J. B. Mackie took over his duties.
328. The present report deals entirely with new work done by the Malaria Bureau during the year 1938, and makes no reference to previous research or the extensive routine antimalarial work. These can be found by those interested in the Annual Reports of 1930-1936.
329. Deaths ascribed to malaria were 733, or 1.9 per centum of deaths registered from all causes. The corresponding figures for 1937 were 699 and 2 per centum respectively.
330. Incidence of malaria in the Colony. In areas outside of the control of the Bureau, namely in the New Territories and at the Lyemun Barracks, there was a general increase in malaria above the normal autumnal rise. This was attributable to:
(a) a low rainfall resulting in insufficient flushing of the streams,
(b) a slight persistent rainfall well into October insufficient to flush the streams, but enough to keep open seepages and swamps, and
(c) the influx of a large number of refugees from malarious rural districts in Kwangtung, whose resistance had been lowered by under-nourishment, fatigue, and exposure.
331. There was increase in malaria amongst the troops, but this mainly occurred amongst those posted on the frontier during the Japanese invasion of Kwangtung. In the barracks at Lyemun there were a number of cases. The Army Authorities have, however, increased the scope of their antimalarial operations, and it is hoped that this will prevent a recurrence in 1939. The Police stationed in the New Territories shared in the general increase in malaria.
332. Disturbance of soil has not been found to be a factor of any great consequence in increasing the number of breeding places of the important anophelines.
333. Night catching was discontinued in 1938, as inspectors previously working in the Laboratory were needed for field work under the expansion of the antimalarial programme. One inspector only was retained in the Laboratory.
334. No new species were discovered in 1938. Identification of the species found gave the following results:
A. minimus, A. jeyporiensis var. candidiensis, A. maculatus, A. hyrcanus var. sinensis, A. fluviatilis, A. aitkenii var. bengalensis, A. splendidus, A. karwari and A. vagus.
335. The first two species are responsible for serving as vectors in the major number of cases of malaria that occur.
336. Catching at Pat Heung was discontinued in September, 1938, due to the taking over of the Camp for refugees.
337. It is noteworthy that the catches of adult mosquitos at several stations were found to be far less numerous than those of preceding years owing to preventive work done.
M 63-
B. Annual Report of the Malaria Bureau, 1938.
327. Dr. R. B. Jackson, O.B.E. left the Colony prior to retirement on 13th September, and Dr. J. B. Mackie took over his duties.
328. The present report deals entirely with new work done by the Malaria Bureau during the year 1938, and makes no reference to previous research or the extensive routine antimalarial work. These can be found by those interested in the Annual Reports of 1930-1936.
329. Deaths ascribed to malaria were 733, or 1.9 per centum of deaths registered from all causes. The corresponding figures for 1937 were 699 and 2 per centum respectively.
330. Incidence of malaria in the Colony. In areas outside of the control of the Bureau, namely in the New Territories and at the Lyemun Barracks, there was a general increase in malaria above the normal autumnal rise. This was attributable to:-
(a) a low rainfall resulting in insufficient flushing of the streams,
(b) a slight persistent rainfall well into October insufficient to flush the streams, but enough to keep open seepages and swamps, and
(c) the influx of a large number of refugees from malarious rural dis- tricts in Kwangtung, whose resistence had been lowered by under- nourishment, fatigue, and exposure.
331. There was increase in malaria amongst the troops, but this mainly occurred amongst those posted on the frontier during the Japanese invasion of Kwangtung. In the barracks at Lyemun there were a number of cases. The Army Authorities have, however, increased the scope of their antimalarial opera- tions, and it is hoped that this will prevent a recurrence in 1939. The Police stationed in the New Territories shared in the general increase in malaria.
332. Disturbance of soil has not been found to be a factor of any great consequence in increasing the number of breeding places of the important anophelines.
333. Night catching was discontinued in 1938, as inspectors previously working in the Laboratory were needed for field work under the expansion of the antimalarial programme. One inspector only was retained in the Laboratory.
334. No new species were discovered in 1938. Identification of the species found gave the following results:-
A. minimus, A, jeyporiensis var. candidiensis, A. maculatus, A. hyrcanus var. sinensis, A. fluviatilis, A. aitkenii var. bengalensis, A. splendidus, A, karwari and A. vagus.
335. The first two species are responsible for serving as vectors in the major number of cases of malaria that occur.
336. Catching at Pat Heung was discontinued in September, 1938, due to the taking over of the Camp for refugees.
337. It is noteworthy that the catches of adult mosquitos at several stations were found to be far less numerous than those of preceding years owing to preventive work done.
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