Acute bacillary dysentery due to Bacillus para-shig˦

Eight cases of acute bacillary dysentery apparently resulting from infection with B. para-shigæ bacilli are described. Six of the cases associated with the para-shigæ (indole —) bacillus, were British patients, and as they were exposed to the same source of infection, it is probable that the incubation period was less than four days. Agglutination tests showed that the para-shigæ (indole —) bacilli belonged to a homologous group, which was serologically distinct from the B. para-shigæ (indole +) strains, and the Shiga group.