﻿64 



The Philippine Journal of Science 



1914 



As in experiment 11, the infective period by natural exposure 

 was shown to be short, and corresponded closely to the febrile 

 period. Further, the infection did not remain active in the 

 corral after the sick animal had passed the infective stage. 



Experiment 13. — This experiment was similar in purpose and 

 technique to experiments 11 and 12, except that carabaos were 

 used exclusively. Carabao 3170 was injected with virulent blood 

 on June 9, 1911, and placed in the usual corral. Susceptible 

 carabaos were exposed for twenty-four hours each at ten, eleven, 

 fourteen, and fifteen days after inoculation, and were isolated 

 as usual. The susceptibility of 3177 was demonstrated later. 

 Further details appear in the following temperature chart: 



'T -^o. 3170. 



1 J 54 5 6 7 8 9 10llienn]5 







4 1 



u^^ 





4on Lr/^^^^^^^^^^^^^^^^^^^^ ™^ 



: :i: : :i ^: ? i I I i i : : : 



39 _ _ -: : : h-t'.-\ ^—- - - — -i: ::_ 



1 }1 A . LumH N 



i-U^-'^ Aa 



OQ __ 2 u 2 - 5 ^5 _ _ _ __ 



OO * y Jt Z L _ _ __ 



: : |_X_: = __ 



4. 1_ 



;^ L \ 



37 xx3^:i:x^:i:xx^::5:2:xp^Tj:x:i:^iLX^^^3::xn: 



Reference to the chart will show that the animal was infective 

 for at least two days preceding the appearance of diagnostic 

 symptoms. The experiment also confirms the belief that the 

 infective period is short and that infectious material does not 

 remain active in the corral. 



INFECTIVENESS OF BLOOD DURING DISEASE 



Experiment 14. — This experiment was planned to give in- 

 formation regarding the presence of rinderpest virus in the 

 blood at various stages of the disease. Bull 3000 was infected 

 by injection with virulent blood on April 11, 1911. Blood was 

 drawn during the disease at various periods corresponding to 

 five, seven, nine, eleven, thirteen, fifteen, seventeen, nineteen, 

 and twenty-one days after the inoculation of the animal and 

 injected into susceptible cattle. These were properly isolated 

 from infection. The work is shown graphically in the temper- 



