﻿IX, B, 1 



Ward et uL: Transmission of Rinderpest 



55 



None of the animals contracted rinderpest ; the susceptibility 

 of all was proved subsequently. 



The chief features of the foregoing experiment are summarized 

 in Table IV. 



Table IV. — Exposure of susceptible carabaos in supposedly infected corral. 



Animal No. 



Interval 

 between 

 removal of 

 sick and 

 exposure 

 of sus- 

 ceptible 

 animal. ^ 



Time of 

 exposure 

 in corral. 



Result. 



Susceptibility 

 test later. 



3104 



Days. 

 1 

 3 

 6 

 7 



Days. 

 2 

 1 

 1 



7 



Negative __. 



do 



do 



do 



Susceptible. 

 Do. 

 Do. 

 Do. 



3079 



3090- . 



3087_ 



The infectivity of the coi'ral was tested, after intervals of from 

 one to seven days after the removal of the sick, by animals kept 

 therein for intervals of from one to seven days, with negative 

 results. 



Experiment 5. — This experiment was planned to determine 

 the duration of infectivity of virus in a corral during hot dry 

 weather. Corral 3 was used for the purpose, and had been 

 supposedly infected by the presence of infected bulls 3330 and 

 3329. On the day that they were removed, the disease had 

 progressed in 3330 to a state corresponding to the twelfth day 

 after inoculation and eighth day after initial rise of temperature. 

 The animal at that time showed a temperature of 40°. 4 C. with 

 diarrhoea and inappetence. With animal 3329, the day corre- 

 sponded to the twentieth after inoculation and seventeenth suc- 

 ceeding the initial rise of temperature. At the time, the most 

 severe stage of the disease had been passed ten days before. 

 The period of exposure of the various animals in the corral is 

 shown in the following notes. 



March 12, 1912. Bulls 3329 and 3330 were removed from the corral at 

 1 p. m. The drinking water to which they had had access was not changed. 

 Further, they had intentionally been provided with an excess of Guinea 

 grass, throvim on the ground in the corral so that it might become infected. 

 This fodder was left undisturbed for the successors of the sick animals. 

 The sky on this day was clear, and the weather hot and windy. 



March 13. At 1 p. m. bull 3341 was placed in the corral after having 

 been deprived of food and water during the forenoon. The animal im- 

 mediately began to eat the soiled fodder, and drank from the pail of water 

 to which the sick animals had had access. The weather continued dry, 

 clear, hot, and windy. 



