Highly sensitive methods for the detection of viral antigens with the use of monoclonal or polyclonal enzyme immunoassay test systems, as well as virus-specific nucleic sequences (NS-gene) in polymerase chain reaction, made it possible to establish the fact of long-term asymptomatic virus carriership (AVC) in some of adolescent schoolchildren in a closed group. The occurrence of AVC varied at different phases of the epidemic process. The tendency to AVC was observed in individuals having blood group B (III) and HLA-A9 antigen of the major histocompatibility complex. The development of AVC occurred in the presence of a decreased level of humoral immunity. AVC was mainly registered among individuals, relatively resistant to relapsing clinically pronounced forms of respiratory virus infections.
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