But the eruption of the "pox" goes on to the development of a pustule, while in foot-and-mouth disease the eruption is never more than a vesicle, even though the contained fluid may become turbid.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
It was inserted fresh from the pustule.
"Makers of Modern Medicine"
James J. Walsh
During the greater part of the year, both kinds of spores are to be found in the same pustule.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke