1980 Volume 33 Issue 10 Pages 481-484
A hog barn which had been used for an infection experiment with Toxoplasma oocysts was cleaned carefully and disinfected with flame. Two pigs were raised independently in two stalls, respectively, in this barn beginning with 75 days after oocyst administration. They manifested clinical symptoms 9 and 14 days and died 20 and 22 days, respectively, after the introduction into the barn. The cause of death was assumed to be infection with oocysts remaining in the barn.
When the barn was disinfected again with hot water, healthy pigs were introduced in it and held under observation for 8 weeks, but they remained free from infection.
In another experiment, healthy pigs began to be housed in a hog barn where an infection experiment was performed with cyst administration 35 days before and no disinfection had been conducted since then. None of them were infected over an observation period of 11 weeks.
These results indicate that oocysts remained in the contaminated barn for a long time and caused toxoplasmosis. Disinfection with abundant hot water seems to be effective for the contaminated hog barn.