RT Journal A1 WALCHER DN T1 KLebsiella pneumoniae associated with infantile diarrhea JF American Journal of Diseases of Children JO American Journal of Diseases of Children YR 1949 FD July 1 VO 78 IS 1 SP 61 OP 64 DO 10.1001/archpedi.1949.02030050070004 UL http://dx.doi.org/10.1001/archpedi.1949.02030050070004 AB THE CLINICAL features of an epidemic of diarrhea involving infants from 6 weeks to 10 months of age were reported in January 1946.1 The organism recovered from the stools of the sick infants was classified as "Bacillus mucosus capsulatus" (Klebsiella pneumoniae). With the use of the biochemical tests as a means of identification, the organism would have been classified as Aerobacter aerogenes. However, in a comparative study of organisms of the Friedländer and coli-aerogenes groups it had been observed2 that known Friedländer organisms gave biochemical reactions characteristic of the coli-aerogenes group and that some strains which had been identified with the usual biochemical criteria as A. aerogenes were observed to possess antigens in common with the three Friedländer types, A, B and C.Therefore, it was thought advisable to employ serologic methods in an effort to classify the organisms more adequately.PROCEDURE AND RESULTS  Four strains of organisms,