Rarely occurring Shigella serovars.

In addition to the predominant Shigella sonnei, also rarely occurring Shigella serovars have been found in Czechoslovakia: 4 serovars of subgroup A (S. dysenteriae 3, 4, 7 and 12) and 11 serovars of subgroup C (S. boydii 2, 3, 5, 7, 9 lactose-positive, 10, 13, 14 aerogenic, mannitol-negative, 15, 16 and the provisional serovar E 16553).

To shigellosis epidemicity in East-Slovakian region.

A set of 2227 strains of Shigella sonnei isolated from dysentery patients in East-Slovakian region from 1975 through 1977 was analyzed by age and sex of patients, place and time of isolation, and by phage type, colicin type and antibiogram patterns of strains. The study showed that some phage types tended to occur in association with certain colicin types, the most common combination being that of phage type 75 and col factór Ei (86% of strains). In 1976 and 1977 this phage type gradually replaced col factor Ia that in 1975 was predominant.