For new Escherichia coli o antigens, o158, o159, o160 and o161, and two new h antigens, h53 and h54.

Four Escherichia coli strains were established as antigenic test strains for four new o groups, o158, o159, o160 and o161. The strains of o158 and o159 were isolated from cases of infantile diarrhoea in Great Britain, while the o160 and o161 strains were isolated from faecal specimens in Arabia. The o161 strain was at the same time designated as test strain of a new H antigen, H54, while a strain belonging to o group 148 was established as antigenic test strain for H53; this strain was also isolated from human faeces in Arabia.

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