Met Munson: Cholera Carriers 
TABLE I.—Stool specimens examined for cholera at the Bureau of Science, 
July—October, 1914—Continued. 










October. For the four months. 
Source of specimen. Trae Posi . 
| osi- | Nega-| Nega-| Posi- 
Total. tive. tive. tive. tive. Total. 
Health station— i | 
| 
DP es es Ep Tae NOE ENS MN ae a et 1,158 6{ 1,147 | 6,257 | 147 6,304 
PAR te AS EU oe ee a Be 2,800 22| 2,778 | 18,948 244 | 14,192 | 
(Og ee a Be ee ahs oe ee ae 1, 489 4) 1,485] 4,236 70 |. 4,166 | 
Tees Sa Urs Dense aera en NUNES Rh eA leno 4) 509) 25768 48| 2,806 
isa mes i pena ee Se SS UE ed | AAG 2 Shs ee | 1,192) 2,189 17 | 2, 206 
Potala east eee aol Ri ee eh eee 7, 147 36 | 7,111 | 29, 448 526 | 29,974 




It is interesting to note the way in which the cholera carriers 
have fallen off. In October, including Bilibid Prison, whose 
examinations are not included in the above statistical table for 
health stations, a total of 80 carriers was found. Of these 80, 
there were 57 found in the first half of the month and- 23 in 
the last half of the month. Of the 23 carriers found in this 
last half-month, only 8 occurred in the last week of October. In 
the first week of November, only 3 carriers were found. In 
the first twelve days of November, as a result of approximately 
20,000 examinations made during that period, only 3 carriers 
were found. The last carrier was found on November 4, since 
which date up to the present writing some 16,000 examinations 
have been made. 
The foregoing statistical table shows that for the entire out- 
break, up to November 1, when it was practically over, of nearly 
30,000 persons not cholera suspects but systematically examined 
from health stations for purposes of investigation, almost exactly 
1.75 per cent of the population of Manila examined were found 
to be harboring the cholera infection. But such general pro- 
portion was much exceeded in some instances. Station A in 
August showed 118 positives in 4,851 instances taken at ran- 
dom, or 2.4 per cent. One series of 179 dead bodies showed 
3.6 per cent positive; and certain smailer groups among living 
persons showed even higher percentages of infection than the 
foregoing. The Bilibid Prison outbreak, which is not discussed 
in this paper, has had approximately 5 per cent of the prisoners 
found to he cholera carriers. Fortunately for the work of 
eradication, only a.part of the infections above mentioned for 
large groups existed at any one time. 
In some instances, cholera infection was found no more prev- 
alent in cholera contacts than in those not known to have had 
any relation to cholera cases. Thus at Station L for the month 
