Four New Escherichia Coli O Antigens, O148, O151, O152, O153, and One New H Antigen, H50, Found in Strains Isolated from Enteric Diseases in Man

Among Escherichia coli strains received recently at the International Escherichia Centre were several which could not be determined serologically by the available test sera. Some of these strains had a possible causal relationship to the enteric disease from which they were isolated, and it was considered important to establish the hitherto unknown antigens as test antigens. This paper reports the examination of some of such strains isolated from human disease. The paper concludes with a short discussion of the present concepts of K antigens in E. coli, explaining why new K antigen numbers were not established on the basis of the strains examined.