﻿IX, B, 1 



Ward et al.: Transmission of Rinderpest 



63 



from the corral. The animals were infective during three days 

 of the febrile period, and only so during two or possibly three 

 days of the period when symptoms were marked. Thus, these 

 two animals were infective during only two or three days of 

 the period when the disease could have been recognized by in- 

 spectors in the field. 



It should be noted that irrespective of the presence or absence 

 of infection from 3060, no infective material, deposited in the 

 previous days, remained active after the eleventh day. This 

 confirms the observations in the three preceding experiments, 

 and is more important because in this small crowded corral 

 there was no possibility of escaping infection as animals might 

 in a larger one. 



Experiment 12. — The purpose of this experiment was to deter- 



-;v ^..3098an.3O90. 



12 3 4 5 6 7 8 9 10 U U V3 L4 15 16 17 le 19 20 21 22 







^ ^ ~ ~ 





At L. J.- Sl_ _ 



41 _ _ — n^ « I J. ji 



"- Ju3i»-- "^ 



'■ t -i^ -r-A i % 



J \ \ i. ...... ^ 



A(\ _ __ _ «.:_r^D_Qi_ * _ <^<^ 



4U R * Y ' «> "'^ 



i - '4 ^ -. ^ '^ o" 



» 3 7 - t o -"« 



* ^ 51 i-^J- 



OQ ^ i i, 4-_,_ ■' ., i_ii_i._^_i_^ l_ 



vjy K_" 5 1.^:^^ r ~ ' n E d 5 I 2 



J Z % t, Ki s 5^ -*.-''^^-^ 



5f o- :fj,^i iTo. 2"--,^^ ■ ^ ± 



••l:jJ_j,J. o -1 .1 d j. j. ! ^ [j L' 



n Q , / J JiQ 1 . ... »? . ; ' ' i '' v i; . ."; , 



JO ± ?■ EZtt i^ it ■^-■^-h 



i !^2«>2 



^_ ---- 'to, _ - 



i*^3= 





mine the period during which a carabao and a bull in a corral 

 together would be infective to carabaos by natural exposure. 

 It was a duplication of experiment 11, except as to the kind 

 of animals employed. 



Bull 3098 and carabao 3090 were exposed to natural infection, 

 and were placed in the same corral as used in experiment 4. 

 Beginning with the eighth day after the original animals had 

 contracted the disease up to the twenty-second day, excepting 

 only the ninth, susceptible carabaos were exposed for twenty- 

 four hours each in the corral with the carabao and bull. After 

 exposure the carabaos were disinfected outside of the corral 

 and isolated. The susceptibility of the animals that gave nega- 

 tive results upon exposure was proved in subsequent exper- 

 iments. Further details appear in the double temperature chart 

 of animals 3098 and 3090. 



