﻿442 



The Philippine Journal of Science 



1914 



DISTRIBUTION OF CASES 



A. Geographic distribution. — An analysis of the cases accord- 

 ing to the apparent place of contraction of infection gave Manila 

 35,6 per cent, Mindoro 17.5 per cent, Tarlac Province 9.8 per 

 cent, Laguna Province 9.5 per cent, and miscellaneous provinces 

 27.6 per cent. It is absolutely certain that the vast majority of 

 the infections apparently contracted in Manila were in reality 

 contracted elsewhere. As a matter of fact, while malaria is 

 endemic in Manila it is not a common disease here. It is believed 

 by some physicians that it is very rare indeed, because it is 

 almost impossible to find an infection in an individual who has 

 never been outside of the city limits. This same argument 

 could, however, be applied to typhoid fever or any other disease 

 which occurs here, as Manila occupies such a limited amount of 

 territory that it would be rather difficult to find a child, to say 

 nothing of an adult, who had not been recently beyond its 

 borders into Rizal or Bulacan Province. 



The Bureau of Health's report for 1913 for the entire Philip- 

 pines, excepting Mindanao and Mindoro, gives a very different 

 distribution of malaria in the Islands than is indicated in Table 

 I. According to the clinical cause of death the distribution is, 

 in part, as follows : 



Table I. — Distribution of malaria in the Philippine Islands. 



Province. 



Percent- 

 agre 



of deaths 

 due to 

 malaria 



clinically. 



Ca^ayan 



Ambos Camarines 



Batancras 



Oriental Negros .. 

 Leyte.- _. 



27.6 

 20.6 

 18.6 

 18.4 

 18.0 



Province. 



Percent- I 



age 



of deaths! 



due to 



malaria | 



clinically.! 



Laguna.- 



Tarlac 



Occidental Negros 



Bohol— 



Manila 



17.8 

 16.6 

 16.3 

 14.4 

 0.8 



Musgrave, Walker, and others^ found malarial organisms in 

 the blood of 34,06 per cent of 1,095 individuals in Mindoro, in 

 February, 1912. 



B. Race, sex, and age distribution. — The race, sex, and age 

 distribution of the cases is given in Table II. Fifty per cent 

 of 66 Japanese, 4.8 per cent of 5,166 Filipinos, 4,8 of 352 

 persons of miscellaneous race, and 4.2 per cent of 1,148 Amer- 

 icans were cases of malaria. 



^This Journal, Sec. B (1914), 9, 137. 



