[In vitro activity of an extract of Yersinia enterocolitica 0:3 biotype 4 on lymphoblastic transformation].

Effects of an extract from Y. enterocolitica 0:3 biotype 4 on mouse splenocytes and human lymphocytes cultures were examined. Low doses had a mitogenic action on splenocytes, while high doses inhibited tritiated thymidine incorporation into the cells. With human lymphocytes only inhibitory effect was observed.