[Rate of formation of postvaccinal immunity to plague in animal experiments].

The authors present the results of experimental studies on guinea pigs of the dynamics of plague immunity formation after a single inhalation immunization of the animals with live plague vaccine. Plague immunity proved to develop as soon as 24 hours after the application of the preparation; by the 3rd day the resistance level was 68 times greater than the control one. Immunity reached the maximal intensity by the 20th day after the vaccination. The level of specific resistance decreased 1.6 by the 3rd month.