Four strains ofEdwardsiella tarda, a recently described member of the Entero-bacteriaceae, were studied, They were isolated from four out of 832 children during a 3-year survey of juvenile diarrhoea at Vellore, S. India. Three of the four children had diarrhoea when the organisms were isolated and one was convalescent from bacillary dysentery. From this study and a review of the literature it appears thatEd. tardais found only infrequently in man and that its main reservoir may be in animals such as snakes and seals. It is suggested that this organism should be specifically looked for in cases of diarrhoea to determine its etiological role, particularly when the major intestinal pathogens are not isolated.This work forms part of the studies on the etiology of diarrhoeal infections in children for the Ph.D thesis of P.B., and the grant from the Indian Council for Medical Research towards these studies is gratefully acknowledged. We also wish to thank Dr Sakazaki for serotyping the strains.
Summary: The results are given of a biochemical study of 21 strains of C27. An Adansonian analysis was carried out by electronic computer on these strains and the Aeromonas strains studied in the previous paper (Eddy, 1962). The analysis confirms the proposal that the C27 strains should be excluded from the genus Aeromonas and a description of the new genus, Plesiomonas (Habs & Schubert, 1962), for these organisms is given. The analysis did not clearly establish Aer. formicans as a species distinct from Aer. punctata.
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