[Diarrhea, erythema nodosum, arthralgia].

Following antibiotic treatment of febrile tonsillitis, a 20-year old man developed watery diarrhea during military service. He was admitted to the infirmary by the medical officer. During the last year the patient had traveled to Spain. The history of recent food intake was not remarkable. The clinical investigation revealed a slightly tender liver. A markedly elevated ESR, a consecutively developing erythema nodosum on both lower legs and arthralgias opened a broad spectrum of differential diagnoses that are discussed here. Stool cultures grew salmonella typhimurium. The clinical picture, the treatment and possible complications of this salmonellosis are discussed.