A biochemically and serologically homogeneous group of bacterial strains is described. The strains were selected because of their biochemical and serological similarity to strain number 145/46, which was isolated from a patient with the symptoms of clinical dysentery in the British Isles in 1946. Similar strains, sometimes called “serotype 147,” have been described as biochemically atypical members of O group 25. Other studies have suggested, on the basis of biochemical tests and pathogenicity tests, that such strains should be classified as and the names 13, , and have been proposed for them. Some workers have proposed that these strains should be regarded as intermediate between and . There is little doubt that these organisms have caused outbreaks of bloody diarrhoea resembling bacillary dysentery, but pathogenicity cannot be considered as a criterion for inclusion in the genus . The present study shows that the organisms can be classified biochemically as but they are atypical in being nonmotile, anaerogenic, and non-lactose-fermenting; serological studies show that these organisms can easily be distinguished from all currently recognised O groups (O1 to O163). It is proposed that these strains should be regarded as members of a new O group, O164.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error