Show Potent Virus In tests department of agriculture experimenters found that one one- one millionth of a cubic centimeter of blood drawn from a hog infected with cholera was very frequently sufficient to infect another hog with cholera cholera and and one-half one five hundred thousandths of a cubic cen cen- centimeter centimeter centimeter produced cholera A teaspoon holds 36 cu cu- cubic cubic cubic bic centimeters Doses of one five- five millionth of a cubic centimeter were not infective Cholera virus was most abundant in the blood of artificially infected hogs on the sixth to eighth days after infection |