[A "new cause of erythema nodosum worth knowing: yersinia-infections (author's transl)].

In the German literature little has so far been published on the appearance of erythema nodosum (e.n.), particularly in childhood, following Yersinia infections. We have seen a boy aged 10 years and 8 months with marked e.n. on the legs and mildly on the left fore-arm. This had been preceeded by typical enteritic symptoms; contact with numerous animals was noteworthy. When we treated him with penicillin V, septic fever and a rise in the ESR occurred. Serologic examination showed high titres against Yersinia pseudotuberculosis. The titre of type I fell, that of type II rose which indicated a mixed infection. In view of the increasingly common reports on e.n. following Yersinia infections in adults we have to assume that in childhood, too, Yersinia infections will be found increasingly as a cause of e.n.