M 67
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.
282. The first two species are responsible for serving as vectors in the major number of cases of malaria that occur.
283. In September, 1939, it was found possible to spare an inspector to take charge of a field station in connexion with anti-malarial work at the Refugee Camp at Kam Tin. With the funds available, it was impossible to engage a labour force adequate to deal with the surrounding paddy. A species control of A. minimus and A. jeyporiensis only, therefore, in the surrounding half mile area, was attempted. This involved the routine clearing and oiling of all streams and irrigation ditches. Propaganda amongst the villagers to obtain weekly draining off of the paddy was partly successful.
A blood survey amongst the 1,500 refugees showed an infection rate of 24.59%
The Kam Tin Valley is a favourable breeding place for A. vagus which is not easily found in other parts of the Colony. The opportunity of catching and dissecting this species in considerable numbers was therefore taken. From the attached tables, it will be seen that of the 688 dissected, no stomach or gland infections were found. In surveys in the surrounding country, its larval breeding places namely, grassy pools, hoof-marks, wet cultivations, paddy fields and furrows between crops were verified. Dissection of other species confirmed previous research work, incriminating A. minimus and A. jeyporiensis as good carriers and A. hyrcanus as a poor one.
284. Routine checking catches of adult mosquitos at stations under control of the Bureau were carried out. Few anophelines were caught, and none of those obtained were found to be infected.
285. The anti-malarial programme carried out in 1938 was maintained. This work involving, as it did, clearing and oiling of some 84,000 yards of streams, and inspection of 24 square miles of territory, was carried out by the seven inspectors of the Bureau and a coolie labour force of 105.
In addition, the following new anti-malarial work was carried out :-
(a) Kowloon City.
Control of a large area of wet cultivation and its concomitant network of streams and irrigation ditches was obtained between Kowloon City and the R.A.F. Barracks at Kai Tak. In addition to routine anti-malaria measures, propaganda was carried out in the villages and schools to educate the inhabitants in dryer and tidier methods of cultivation. The mosquito nuisance at the Kowloon City airport subsequently entirely disappeared, and no cases of malaria were recorded from the civil airport personnel.
(b) A few cases of malaria occurred amongst the troops at the Sham Shui Po Barracks. Work was undertaken by the Bureau in the surrounding area with a labour force provided by the Army. No further cases of malaria occurred.
(c) The H. B. Brewery situated at Sham Tseng in the New Territories requested assistance at the beginning of this year. Anti-malaria work was carried out for half mile round the brewery. The cost of the work was borne by the management, its supervision was undertaken by the Malaria Bureau. The local village population co-operated well in the weekly drainage of paddy and the care of irrigation ditches.
M 67
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.
282. The first two species are responsible for serving as vectors in the major number of cases of malaria that occur.
283. In September, 1939, it was found possible to spare an inspector to take charge of a field station in connexion with anti-malarial work at the Refugee Camp at Kam Tin. With the funds available, it was impossible to engage a labour force adequate to deal with the surrounding paddy. A species control of A. minimus and A. jeyporiensis only, therefore, in the surrounding half mile area, was attempted. This involved the routine clearing and oiling of all streams and irrigation ditches. Propaganda amongst the villagers to obtain weekly draining off of the paddy was partly successful.
A blood survey amongst the 1,500 refugees showed an infection rate of 24.59%
The Kam Tin Valley is a favourable breeding place for A. vagus which is not easily found in other parts of the Colony. The opportunity of catching and dissecting this species in considerable numbers was therefore taken. From the attached tables, it will be seen that of the 688 dissected, no stomach or gland infections were found. In surveys in the surrounding country, its larval breeding places namely, grassy pools, hoof-marks, wet cultivations, paddy fields and furrows between crops were verified. Dissection of other species confirmed previous research work, incriminating A. minimus and A. jeyporiensis as good carriers and A. hyrcanus as a poor one.
284. Routine checking catches of adult mosquitos at stations under control of the Bureau were carried out. Few anophelines were caught, and none of those obtained were found to be infected.
285. The anti-malarial programme carried out in 1938 was maintained. This work involving, as it did, clearing and oiling of some 84,000 yards of streams, and inspection of 24 square miles of territory, was carried out by the seven inspectors of the Bureau and a coolie labour force of 105.
In addition, the following new anti-malarial work was carried out :-
(a) Kowloon City.
Control of a large area of wet cultivation and its concomitant network of streams and irrigation ditches was obtained between Kowloon City and the R.A.F. Barracks at Kai Tak. In addition to routine anti- malaria measures, propaganda was carried out in the villages and schools to educate the inhabitants in dryer and tidier methods of cultivation. The mosquito nuisance at the Kowloon City airport subsequently entirely disappeared, and no cases of malaria were recorded from the civil airport personnel.
(b) A few cases of malaria occurred amongst the troops at the Sham Shui Po Barracks. Work was undertaken by the Bureau in the surrounding area with a labour force provided by the Army. No further cases of malaria occurred.
(c) The H. B. Brewery situated at Sham Tseng in the New Territories requested assistance at the beginning of this year. Anti-malaria work was carried out for half mile round the brewery. The cost of the work was borne by the management, its supervision was undertaken by the Malaria Bureau. The local village population co-operated well in the weekly drainage of paddy and the care of irrigation ditches.
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