[Ribosomal dysentery vaccine. Study of response and antigenic activity in healthy volunteers].

In earlier studies Shigella sonnei ribosomal vaccine was shown to be highly protective for guinea pigs and monkeys. The object of the present study, carried out in 20 healthy volunteers, was the safety and the antigenic activity of this vaccine. The subcutaneous injection of the ribosomal vaccine in doses of 100 micrograms and 200 micrograms produced no febrile reactions nor biochemical and histological changes. The minimal local reaction was observed after injection into the subscapular region: in this case 200 micrograms of the vaccine produced neither severe, nor moderate reactions. A single injection of this dose led to a more than 4-fold rise in the levels of total and cysteine-resistant O-antibodies, as well as to the prolonged elevation of the complement level in the serum.