328 
Parasite of East Coast Fever 
Record of Cow 1. 
Date Day Temp. 0 ]?. 
10. ii. 09. 1 — 30 ticks ( Rh. evertsi i s and ? s) were placed on the Cow. 
2 — 
3 
— 
4 
— 
5 
— 
6 
— 
7 
101*2 p.m. 
8 
102-2 „ 
9 
101-6 ,, 
10 
101-4 „ 
11 
101-8 „ 
12 
• — 
13 
102-0 „ 
> 
14 
102-0 „ 
15 
103 0 „ 
16 
(103-0 a.m. 
1104-2 p.m. 
17 
f 103-2 a.m. 
1104-4 p.m. 
Parasites first seen, very few. 
18 
103-0 a.m. 
,, very few. 
19 
1104-0 „ 
i 105-0 p.m. 
5 % of corpuscles infected. 
20 
105-6 „ 
10 °/ 0 „ 
21 
(105-0 a.m. 
16 °/n „ 
1105-4 p.m. 
22 
105-0 „ 
25 % „ 
23 
101-2 „ 
28 % 
24 
103-6 „ 
40 % .. 
25 
101-6 „ 
56 °/o .. 
26 
101-4 a.m. 
51 % 
27 
104-6 p.m. 
52 °/o >, 
28 
104-6 a.m. 
62% 
29 
105-4 „ 
62% » 
30 
104-0 „ 
60% .. 
31 
102-0 „ 
75 % „ 
13. hi. 09. 32 
Cow died 7 
a.m. of East Coast Fever. 74 % of corpuscles infected 
In the case of Cow 1 the temperature rose'above 101° F. on the 16th day 
after the first ticks were applied, and the parasites appeared in small 
numbers on the 17th day. Beginning with the 19th day infected 
corpuscles occurred in appreciable numbers and their numbers increased 
steadily so that beginning with the 19th day 5°/o. then 10°/o> 16°/ 0 . 
25 %, 28 %, 40 %, 56 % 51 »/„, 52 «/ 0 , 62 «/„, 62 % 60 % 75 »/ 0 of infected 
corpuscles were recorded on successive days. In a blood film taken 
within a couple of hours after death on the 32nd day 74°/o °f the 
