M 34
81. Respiratory diseases accounted for 44.93 per cent of the total deaths, the percentage for 1932 being 43.05.
82. The principal diseases causing death were broncho-pneumonia, pulmonary tuberculosis, bronchitis, pneumonia, infantile diarrhoea and diarrhoea.
83. The overcrowded houses combined with the expectorating habits of the Chinese furnish sufficient explanation for the prevalence of respiratory troubles.
Mosquito-borne Diseases.
84. The mosquito-borne diseases of the Colony are Malaria, Dengue and Filariasis. None of these are notifiable diseases and complete incidence figures are not available.
MALARIA
85. This disease which in the early days of the Colony was the great cause of death and from which Hong Kong derived its reputation of unhealthiness has now practically disappeared from the populous centres of Victoria and Kowloon as the result of the destruction of the breeding places of the carriers through efficient drainage. There is still some malaria in the outskirts of the two towns and a considerable amount in the rural areas of both the Island and the Mainland.
86. Investigations have proved that swamps, ponds and other collections of water in the open plains, are more or less harmless and that the real danger lies within mosquito flight distance of the feet of hills and of valleys where collections of spring water in pockets, pools, swamps and streams form the breeding places of Anopheles Maculatus, Anopheles Minimus and Anopheles Jeyporiensis.
87. Why it is so we do not know but spring water which has not lost its sparkle does have an attraction for these three species. As a rule such water has a faint acid reaction due to dissolved carbonic acid gas. When it loses its CO2 and becomes flat it ceases to attract.
88. For many years the chief Vector in the Colony and New Territories was believed to be A. Maculatus. The researches of Dr. Jackson have proved this to be incorrect. A. Maculatus is a carrier but is of far less importance in the spread of malaria than A. Minimus and A. Jeyporiensis.
89. It appears that species of mosquitoes, like races of men, can under different conditions of climate and surroundings develop differences in habits and tastes for food. A. Maculatus in Malaya readily takes human blood and is a very potent agent in the spread of malaria. In Hong Kong, where it is very prevalent, it seems to prefer animals to humans and its importance as a Vector of paludism is much less pronounced.
M 34
81. Respiratory diseases accounted for 44.93 per cent of the total deaths, the percentage for 1932 being 43.05.
82. The principal diseases causing death were broncho- pneumonia, pulmonary tuberculosis, bronchitis, pneumonia, in- fantile diarrhoea and diarrhoea.
83. The overcrowded houses combined with the expectora- ting habits of the Chinese furnish sufficient explanation for the prevalence of respiratory troubles.
Mosquito-borne Diseases.
84. The mosquito-borne diseases of the Colony are Malaria, Dengue and Filariasis. None of these are notifiable diseases and complete incidence figures are not available.
MALARIA
85. This disease which in the early days of the Colony was the great cause of death and from which Hong Kong derived its reputation of unhealthiness has now practically disappeared from the populous. centres of Victoria and Kowloon as the result of the destruction of the breeding places of the carriers through efficient drainage. There is still some malaria in the out-skirts of the two towns and a considerable amount in the rural areas of both the Island and the Mainland.
86. Investigations have proved that swamps, ponds and other collections of water in the open plains, are more or less harmless and that the real danger lies within mosquito flight distance of the feet of hills and of valleys where collections of spring water in pockets, pools, swamps and streams form the breeding places of Anopheles Maculatus, Anopheles Minimus and Anopheles Jeyporiensis.
87. Why it is so we do not know but spring water which has not lost its sparkle does have an attraction for these three species. As a rule such water has a faint acid reaction due to dissolved carbonic acid gas. When it loses its C.02 and becomes flat it ceases to attract.
88. For many years the chief Vector in the Colony and New Territories was believed to be A. Maculatus. The researches of Dr. Jackson have proved this to be incorrect. A. Maculatus is a carrier but is of far less importance in the spread of malaria than A. Minimus and A. Jeyporiensis.
89. It appears that species of mosquitoes, like races of men, can under different conditions of climate and surroundings deve- lop differences in habits and tastes for food. A. Maculatus in Malaya readily takes human blood and is a very potent agent in the spread of malaria. In Hong Kong, where it is very prevalent. it seems to prefer animals to humans and its importance as a Vector of paludism is much less pronounced,
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