﻿rx, B, 1 



Ward et al.: Transmission of Rinderpest 



65 



ature chart of bull 3000. Plus or minus signs indicate whether 

 or not the animals injected with blood did or did not develop 

 rinderpest in isolation. 



The blood of 3000 was not infective on the fifth day, but was 

 infective on the seventh, ninth, and eleventh days. On the 

 thirteenth, fifteenth, seventeenth, nineteenth, and twenty-first 

 days no infection resulted from the injection of blood from 

 this animal. 



The susceptibility of the animals giving negative results in 

 this experiment has been shown by their contracting rinderpest 

 in subsequent experiments. 



A consideration of the results obtained from this animal, 

 together with those of experiment 11, would lead to the con- 

 clusion that the blood is infective early in the disease, before 



the anim^il is capable of transmitting the disease by natural 

 exposure. 



Experiment 15. — This experiment was similar in purpose to 

 the preceding one. Blood from bull 3063 was injected into sus- 

 ceptible cattle at six, eight, ten, twelve, fourteen, and sixteen 

 days after the bull had been injected on April 1, 1911. The 

 details of the experiment are presented in graphic form in the 

 temperature chart. 



The blood was infective on the sixth day of the experiment, 

 which was the third day before a rise of temperature. It was 

 likewise infective in the eighth, tenth, twelfth, fourteenth, and 

 sixteenth days when the animal died. 



Observations regarding the infectiveness of blood in the later 

 stages of the disease of the two animals in this and the preceding 



124293 5 



