[Serovariation of the plague pathogen capsular antigen]

The phenomenon of serovariation in the capsule antigen of the plague pathogen has been found. The synthesis of FI-serovar is determined by the expression of the caf1M gene. The damages in the caf1M gene structure result in production of the FI1 and FI2 serotypes. Expression of the caf1M gene does not affect the secretion of FI-antigen.