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results of night catching, Table XI of morning catching. Day checking catches were done from time to time by an Inspector.
56. Table XII gives the results of dissections for malarial infection. The infection rate for A. minimus was low in the first half of the year in comparison with the second half as is usually the case. The rate for the year was also low, 2.32% in comparison with 5.50% for 1933, and 5.63% for 1932.
57. Of the few A. hyrcanus caught one was found infected in October, with one oocyst 46μ in diameter with fine yellowish pigment grains arranged in a clump.
(2) Shing Mun Camp.
58. By the end of 1933 anti-larval measures were in force over an area within half a mile distance from the Camp. Measures directed against A. jeyporiensis larvae had been taken along the Shing Mun and its tributaries from Pineapple Pass to P.W.D. Dam, and in the valley of stream A5 as far as the Access Road. The labourers were housed in permanent buildings. Nine additional lines were built during the year. From September 1933 attempts were made to render the lines mosquito-proof. The average monthly population was 1286 as compared with 595 in 1933.
59. The daily mosquito catching was done by two coolies of the labour force who searched each line from end to end with the aid of an electric torch and brought the results to the Malaria Bureau.
The catches are indicated in Table XIII.
60. Of the important carriers of malaria A. minimus and A. jeyporiensis, 1033 and 5482 were captured in 355 morning searches as compared with 4644 and 25317 in 239 mornings in 1933. In July 1933, 5929 A. jeyporiensis were captured, more than the whole catch for 1934.
61. The catches of A. minimus increased considerably during the last quarter, those of A. jeyporiensis rose in May, continued high until November, then dropped in December. A considerable number of A. maculatus were taken especially from June onwards, the total catch being 1055 as compared with 277 in the previous year. A. hyrcanus was poorly represented in the June-September catches which results are interesting in view of those obtained from the investigations made into the larval density in the Shek O rice fields. Like A. maculatus it usually leaves the building after feeding but in this instance both species were trapped by the mosquito gauze,
62. The records of dissections for malaria are given in Table XIV. The infection rates of A. minimus, A. jeyporiensis, A. maculatus, A. hyrcanus were 2.97%, 0.58% was corrected to 3.58%, 1.11%, .27% respectively. In 1933 they were 12.48%, 9.93%, 3.48%, 1.21%.
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results of night catching, Table XI of morning catching. Day checking catches were done from time to time by an Inspector.
56. Table XII gives the results of dissections for malarial infection. The infection rate for A. minimus was low in the first half of the year in comparison with the second half as is usually the case. The rate for the year was also low, 2.32% in comparison with 5.50% for 1933, and 5.63% for 1932.
57. Of the few A. hyrcanus caught one was found infected in October, with one oocyst 46. in diameter with fine yellowish pigment grains arranged in a clump.
(2) Shing Mun Camp.
58. By the end of 1933 anti-larval measures were in force over an area within half a mile distance from the Camp. Measures directed against A. jeyporiensis larvae had been taken along the Shing Mun and its tributaries from Pineapple Pass to P.W.D. Dam, and in the valley of stream A5 as far as the Access Road. The labourers were housed in permanent buildings. Nine addi- tional lines were built during the year. From September 1933 attempts were made to render the lines mosquito proof. The average monthly population was 1286 as compared with 595 in 1933.
59. The daily mosquito catching was done by two coolies of the labour force who searched each line from end to end with the aid of an electric torch and brought the results to the Malaria Bureau.
The catches are indicated in Table XIII.
60. Of the important carriers of malaria A. minimus and A. jeyporiensis, 1033 and 5482 were captured in 355 morning searches as compared with 4644 and 25317 in 239 mornings in 1933. In July 1933, 5929 A. jeyporiensis were captured, more than the whole catch for 1934.
61. The catches of A. minimus increased considerably during the last quarter, those of A. jeyporiensis rose in May, continued high until November, then dropped in December. A considerable number of A. maculatus were taken especially from June on- wards, the total catch being 1055 as compared with 277 in the previous year. A. hyrcanus was poorly represented in the June- September catches which results are interesting in view of those obtained from the investigations made into the larval density in the Shek O rice fields. Like A. maculatus it usually leaves the building after feeding but in this instance both species were trapped by the mosquito gauze,
62. The records of dissections for malaria are given in Table XIV. The infection rates of A. minimus, A. jeyporiensis, A. maculatus, A. hyrcanus were 2.97%, 3.58%, 1.11%. .27% respec- tively. In 1983 they were 12.48%, 9.93%, 3.48%, 1.21%.
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