Analysis of 140 strains of E. coli isolated from patients with pyelonephritis has demonstrated heterogeneous antigens (in 44.3% of cases) related to ABO antigens against human red blood cells. 0(H)-like antigen occurred most frequently. The data obtained suggest that the presence of heterogeneous antigens in E. coli is associated with the formation of a latent subclinical form of pyelonephritis and with the decrease titers of antibacterial antibodies in patients.
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