FOWL CHOLERA 73 
BLOOD COUNTS OF FOWLS INFECTED BY INGESTION AND INFECTED NATURALLY 
Fowl. White Red Remarks. Temperature. 
Corpuscles. _ Corpuscles. 
No. 3 23,000 2,290,000 percmm. 38 days after exposure to infection .. .44.8° C. 
No. 3 20,000 2,800,000 “ “ 4" rs re - .. .43.7° C, 
No. 6 37,000 3,930,000 “ “ Se se i i +2 $43.8" Gy 
No. 8 87,000 4,490,000 “ “ 3" oe e we os .. 42.8° C.. 
No. 8 101,000 2,960,000 “ “ 4 “ 7 as a oe . . 42.2° C. 
AS etedegese 58,000 1,710,000 “ “™ Naturally infected................. 42.8° C. 
Be ce ios 45,000 1,925,000 “ <“‘ 9 ROY > esaiassaaasacaiena te Greeaiadesuacandn tines 
BLOOD COUNTS OF APPARENTLY HEALTHY FOWLS 
Fowl. White Corpuscles. Red Corpuscles. 
NOs dhcasuseweeens poereMeaneets ieee meets S 24,000 2,980,000 per cmm. 
ING iy Rezaiciic hiticaian cd crt Sadecaeytodd Sushaiin tra sabdstansesenanteaen wt 26,300 2,987,000 “ <“ 
NIN ete erate Bs ARS AEA aa a nh Aiea 36,000 8,115,000 “ “ 
IN Gis iB sce sesrcsnctrssteauietesrace sane ee sbcacacing ent se oper eseme a ai 52,000 3,980,000 “ “ 
ING. AG 6 serracceny cakeeummsummery aeaeloenemmee ye 61,000 3,920,000 “ “ 
NO. ll sse¢ cane w ss daceaneeneseaearauee ane 30,000 2,380,000 “ “ 
NGOs 1B) ia scidieraae Saree mencoas tat Oteoatamatese 24,000 2,620,000 “ “ 
Diagnosis. Fowl cholera is diagnosed by the symptoms, 
lesions and bacteriological examination. The specific cause is not 
difficult to isolate. Fowl cholera is to be differentiated from: 
A number of dietary disorders which cause the death of a large 
number of fowls. Such cases are often thought to be chicken cholera 
and so reported by the owners. A diagnosis is to be made from the 
bacteriological findings. 
It is to be differentiated from fowl typhoid. There are a number 
of resemblances in the clinical history of the two diseases. There are, 
however, marked differences in both the morbid anatomy and etiology 
For a comparison see fowl typhoid. 
Prevention. Pasteur introduced a preventive inoculation or 
vaccine for this disease. Kitt found that the eggs of fowls unknown 
to this disease possessed a substance somewhat similar to antitoxin. 
He immunized fowls by injecting them simultaneously with from 
four to eight cubic centimeters of the whites of such eggs. More 
recently he has obtained a horse serum that promises to be of im- 
munizing value. Jensen obtained good results in immunizing geese 
against this disease by the use of serums. There does not appear, 
however, to be a reliable immunizing agent. Hadley has used sub- 
cutaneous injections of diluted carbolic acid. 
