VECTOR OF CANINE PIROPLASMOSIS DUE TO P. GIBSONI 361
present experiments, only two dogs provided the infective feed to the larval ticks,
as shown in the following Table :—
Ticks |
Dog |
Number of |
Number |
Duration |
Average body |
Remarks |
Lot A . |
239 |
200-300 . |
All . |
4 days . |
102.3°F. . A few |
|
„ B . |
239 |
About 100 |
All . |
5 „ . |
102°F. Rare |
|
„ C . |
239 |
500-600 . |
All . |
6 „ . |
102°F. A few |
|
„ D . |
240 |
200-300 . |
All . |
5 „ . |
102.9oF. Very rare |
|
„ E |
240 |
500-600 . |
About 100* |
4 „ . |
101.5°F. Fairly fre- |
*Cloth-cover |
„ F . |
240 |
About 300 |
All† . |
6 „ . |
101.7°F. A few to |
†Only about 20 |
The temperature shown in each case in the foregoing table represents the
average of the readings taken both in the morning and in the evening during the
full period of the infective feed of the ticks and has been inserted in the table
merely with the object of completing the protocols of the dogs concerned, for, as
already mentioned, the occurrence of febrile symptoms was not found to be a
certain indication of the development of the infection, so that no animal was
regarded as definitely infected until the appearance of a fair number of parasites
in the circulation, associated with varying degrees of anæmic changes, and as will
be seen from the table the larvæ were infected from such dogs as showed these two
symptoms of the disease, except in the case of lots B and D, which, in the absence
E 2