[Phage types of typhoid cultures of the Orel region in 1964-1973].

A total of 810 cultures of the causative agents of typhoid fever were isolated at the territory of the Orel region in 1964-1973 in 655 foci; the phage type was established in 63.5% of the cases, 30.2% of the cultures could not be typed by the available phages, and the rest were polylysable or devoid of Vi-antigen (W-form). A total of 16 phage types were revealed; among them there prevailed phage types A (18%), E (15.1%), F1 (7.3%), and N (5.2%); phage types 28, 46, and 40 were less frequent; phage types C1, T and D6 were revealed in individual cases only. There occurred no significant changes in the phage pattern for the observation period.