M 145
One A. maculatus obtained from the Shing Mun Camp harboured a filaria worm in the thorax, one A. maculatus captured in the village of Wo Li Hop half a mile distant, harboured a similar worm in the thorax. Two unusual larval filaria were found in A. jeyporiensis obtained from Wo Li Hop, one in the thorax and one in the abdominal cavity. The appearance of these four specimens before and after staining did not resemble those usually met with, especially those of A. jeyporiensis.
Larval filaria in the mosquito may be derived from other than human sources, but when these filaria correspond morphologically to the description of those obtained from human sources, are found to develop in the thorax and head of the mosquitoes only, are met with in mosquitoes which are known to feed on human blood, and captured in places where the population harbours micro-filaria, it is extremely improbable that such are not derived from human sources, especially as several of these mosquitoes have been found infected with both malarial and filarial parasites. So far there have been no opportunities of infecting Anophelines or Culicines experimentally, or of ascertaining whether there is a periodicity or not in the human infection. Diseases due to filaria are not often reported in spite of the prevalence of Anopheline vectors (?).
Table VIII gives findings obtained from examination of thick films made from prisoners admitted to Victoria Gaol. These films were taken in the daytime for examination for malarial parasites. Double infection with malarial and filarial parasites were met with on two occasions in thick films obtained from the Gaol and on nine occasions in thick films obtained from Shing Mun.
(c) THE CATCHING AND DISSECTING OF ANOPHELINES FOR MALARIAL INFECTION.
(1) Wong Chok Hang Village and Surroundings. (Little Hong Kong.)
Catching operations had been done here in 1932 and were continued throughout 1933. The locality is surrounded by hills on all sides, except in the direction of the sea. A large stream, with several branches, flows through it. The inhabitants are engaged in growing vegetables and rice and rearing pigs and poultry. Rice is grown in a ravine about 500 yards long, by 120 yards wide, and, in a few terraced plots. A ditch runs along the hill foot by the side of the rice field in its entire length and discharges into the main stream. The people of the village live in houses built of stone roofed with tiles; the others in matshed huts made of bamboo and thatch. The pigsties have low walls and high roofs, supported on poles and are unsuitable daytime resting places for mosquitoes.
In 1931 a high spleen rate was found amongst the children, and in 1932 a micro-filaria rate of 12% was obtained from 106 people examined at night.
M 145
One A. maculatus obtained from the Shing Mun Camp har- boured a filaria worm in the thorax, one A. maculatus captured in the village of Wo Li Hop half a mile distant, harboured a similar worm in the thorax. Two unusual larval filaria were found in A. jeyporiensis obtained from Wo Li Hop, one in the thorax and one in the abdominal cavity. The appearance of these four specimens before and after staining did not resemble those usually met with, especially those of A. jeyporiensis.
Larval filaria in the mosquito may be derived from other than human sources, but when these filaria correspond morpholog- ically to the description of those obtained from human sources, are found to develop in the thorax and head of the mosquitoes only, are met with in mosquitoes which are known to feed on human blood, and captured in places where the population har- bours micro-filaria, it is extremely improbable that such are not derived from human sources, especially as several of these mos- quitoes have been found infected with both malarial and filarial parasites. So far there have been no opportunities of infecting Anophelines or Culicines experimentally, or of ascertaining whe- ther there is a periodicity or not in the human infection. Diseases due to filaria are not often reported in spite of the prevalence of Anopheline vectors (?).
Table VIII gives findings obtained from examination of thick films made from prisoners admitted to Victoria Gaol. These films were taken in the day time for examination for malarial parasites. Double infection with malarial and filarial parasites were met with on two occasions in thick films obtained from the Gaol and on nine occasions in thick films obtained from Shing Mun.
(c) THE CATCHING AND DISSECTING OF ANOPHELINES FOR MALARIAL INFECTION.
(1) Wong Chok Hang Village and Surroundings. (Little Hong Kong.)
Catching operations had been done here in 1932 and were continued throughout 1933. The locality is surrounded by hills on all sides, except in the direction of the sea. A large stream, with several branches, flows through it. The inhabitants are engaged in growing vegetables and rice and rearing pigs and poultry. Rice is grown in a ravine about 500 yards long, by 120 yards wide, and, in a few terraced plots. A ditch runs along the hill foot by the side of the rice field in its entire length and discharges into the main stream. The people of the village live in houses built of stone roofed with tiles; the others in matshed huts made of bamboo and thatch. The pigsties have low walls and high roofs, supported on poles and are unsuitable daytime resting places for mosquitoes.
In 1931 a high spleen rate was found amongst the children, and in 1932 a micro-filaria rate of 12% was obtained from 106 people examined at night.
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