[Increase in the content of thymus hormone sensitive rosette-forming cell precursors in the spleen of mice vaccinated against smallpox].

Smallpox vaccine injection to 2-month-old C57BL/6j female mice caused during the first days significant rise in the number of precursor cells of rosette-forming lymphocytes, sensitive to the differentiating thymus extract effect. The number of these cells returned to the normal level by the 10th day after vaccination.