252 The Philippine Journal of Science 1915 
Race.—Fifty-eight of the cases were Filipinos, 16 were Chi- 
nese, and 1 was an American. 
Sex.—Sixty-two of the fatal cases were in males and 13 in 
females. 
Age.—tThe age of the patients ranged from 5 months to 56 
years. Table I shows the age incidence. 
TABLE I.—Age incidence of fatal plague cases. 




Age. | Cases. || Age. | Cases. 
| \} a8 
Wnderikyenrth i eves. Wey fs 1) || 21't0,25syeans kee eleal 5. ea | yet 
Isto yean sts te tok a eer EL 2) (p26itoiS0'years!-- 25 en ee 12 
| Gitar Ory ears pa naer te Weeee eee ae alter endo wenn et en 14 
Dstorlbyyearstss e222 sh. Pe eae | 9 i 41 to 50 years! 2-2-2522: 8-2. se Se eee 7 
16'to}20 Vears ease) aie See ae oe eS | 15 | Sl yearsiand over so2¢¢! sees eee 2 


Duration of illness—The average duration of illness was five 
days. The occurrence of 6 cases with illness lasting from ten 
to fifteen days makes the general average higher than it other- 
wise would have been. In more than half the cases the duration 
of illness was five days or less. Table II shows the duration of 
illness. 
TABLE II.—Duration of illness in fatal plague cases. 






ofilinese,| Cases. ||opiinese,| Cases. 
Days. Days. 
1 5 9 1 
2 10 3 
3 15 1 0 
4 12 12 0 
5 9 13 0 
6 6 14 i! 
" 9 15 2 
8 2 unknown) 4 



| 
| 
| 
The epidemic which furnished the material for this study was 
entirely of cases of the bubonic type, and it is with that type 
alone that this paper will deal. The epidemiologic and bac- 
teriologic aspects of this same epidemic have been the subjects 
of papers by Heiser? and by Schdbl*®. They have shown a 
direct relation between the incidence of the disease in rats and 
human beings in this epidemic. The origin of the epidemic is 
unexplained, the first recognized case occurring in a native who 
had not been out of Manila. Heiser ascribes it to the importa- 
> This Journal, Sec. B (1918), 8, 109. 
* Ibid. (1918), 8, 409. 
