Apr. 8, 1918 



Sources of Hog-Cholera Infection 



III 



where the nasal secretion was scattered. In this pen one pig sickened 

 16 days after the date on which nasal secretion was last scattered in 

 the pen. 



The secretions and excreta obtained on the fifth day and held at room 

 temperature for 24 hours were all infectious. 



The secretions and excreta obtained on the seventh day and held at 

 room temperature for 24 hours were all infectious. 



In the case of the secretions and excreta obtained on the seventh 

 day and held at room temperature for 48 hours, the urine and feces 

 were infectious, while the eye and nose secretions proved to be no longer 

 infectious. 



The results of this experiment are shown in detail in Table V. 



Table V. — Results of Experiment IV on the infectiousness of blood, excreta, and secre- 

 tions of infected pigs 



MATERIALS COLLECTED AND INJECTED ON SEPTEMBER 21, 1917 (SECOND DAY) 



Material injected. 



10 c. c. of eye-swab dilution . . . 

 do 



10 c. c. of nose-swab dilution. . . 

 do 



5 c. c. of urine 



do 



20 c. c. of fecal suspension 



do 



Result. 



Remained well. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



MATERIALS COLLECTED AND INJECTED ON SEPTEMBER 22, I917 (TIHRD DAY) 



10 c. c. of eye-swab dilution . . . 



....do 



10 c. c. of nose-swab dilution . . . 



....do 



5 c. c. of urine 



....do 



20 c. c. of fecal suspension 



....do 



Died October 9. 

 Died October 12. 

 Died October 9. 

 Remained well. 



Do. 



Do. 

 Died October 4. 

 Died October 12. 



Cholera lesions. 

 Cholera lesions. 

 Cholera lesions. 



Cholera lesions. 

 Cholera lesions. 



MATERIALS COLLECTED AND INJECTED SEPTEMBER 24, 1917 (FIFTH DAy) 



10 c. c. of eye-swab dilution . 



....do 



10 c. c. of nose-swab dilution 

 ....do..... 



c. of urine 



do 



5C. 



20 c. c. of fecal suspension. 

 ....do 



Died October 12. Cholera lesions. 



Do. 

 Died October 10. Cholera lesions. 

 Died October 8. Cholera lesions. 

 Died October 12. Cholera lesions. 

 Killed in moribund condition Octo- 

 ber 12. Cholera lesions. 

 Died October 10. Cholera lesions. 



Do. 



a These pigs were subsequently exposed to hog cholera by virus injections to test their immunity and 

 all developed cholera except pigs No. 764, which remained well and probably possessed considerable 

 natural immunity. 



