90 



PREVENTIVE AND REMEDIAL WORK AGAINST MOSQUITOES. 



Klang. — The area affected by the operations is about 332 acres. Twenty-five 

 acres of virgin jungle and 80 acres of dense secondary growth (in places 30 to 40 feet 

 high) have been cleared and 36 acres of permanent swamp have been drained. The 

 areas cleared are now mainly under grass. 



The total expenditure to end of 1905 has been £3,100 [$15,066], and the cost of 

 annual upkeep is about £60 [$291.60] for clearing earth drains, and £210 [$1,020.60] 

 for town gardeners. 



As will be seen from the following statistics of cases of malaria treated at the district 

 hospital, Klang, the improvement in the health of the inhabitants of the areas treated 

 began immediately after the completion of the drainage and other works and has 

 continued to date. 



Table showing the number of cases of malaria admitted to the Klang hospital from Klang 

 town and Port Swettenham, as compared to the number of cases admitted from other 

 parts of the district. 



Residence. 



1901. 



1902. 



1903. 



1904. 



1905. 



Klang 



334 



88 

 188 

 197 



129 



48 



28 



12 









70 

 204 



21 

 150 



4 



266 



11 





353 







Total 



807 





219 



298 



376 







a Certain persons lived some nights in Klang and some in Port Swettenham. 



The following table shows the number of deaths from fever and other diseases 

 which have occurred at Klang and Port Swettenham during the last six years. The 

 population in 1901 was about 4,000, but has largely increased since. 



Deaths in Klang and Port Swettenham corrected for deaths in hospital. 



Year. 



1900. 



1901. 



1902. 



1903. 



1904. 



1905. 





259 

 215 



368 

 214 



59 

 85 



46 

 69 



48 

 74 



45 





68 









Total 



474 



582 



144 



115 



122 



113 







It will be noted that the remarkable improvement in the health of the inhabitants 

 which occurred in 1902, immediately after the antimalarial works had been completed, 

 has been well maintained. 



The following table shows the number of deaths occurring in the district of Klang, 

 excluding the town of Klang and Port Swettenham. (Population 14,000 in 1901, 

 since largely increased.) 



Deaths in Klang district, excluding Klang town and Port Swettenham. 



Year. 



1900. 



1901. 



1902. 



1903. 



1904. 



1905. 



Fever 



173 

 ■133 



266 

 150 



227 

 176 



230 

 198 



286 

 204 



351 





271 









Total 



306 



416 



403 



428 



490 



622 



These figures are especially valuable as a proof that the marked improvement in 

 the health of the inhabitants of the towns of Klang and Port Swettenham is due to the 

 antimalarial measures carried out, and not to a general improvement in the health of 

 the district. 



