Two kinds of monoclonal antibodies to tick-borne encephalitis virus.

Two types of monoclonal antibodies (MA) of the KEN and NEK series prepared to tick-borne encephalitis (TBE) virus differed in the spectrum of their reactivity in serological tests and in their ability to react with individual representatives of the TBE virus complex. The KEN series MA were induced to the 4072 strain isolated from the blood of a patient in the U.S.S.R. The NEK series MA were prepared to the Skalica strain isolated from a bank vole in Czechoslovakia. Both groups of MA belonged to IgG class, reacted in immunofluorescence (IF) test, but possessed no haemagglutination inhibiting (HI) activity. MA of the NEK series reacted in the IF and complement fixation (CF) tests with all members of the TBE virus complex, except of the Powassan virus. MA of the KEN series had no CF activity and in the IF test, they did not react with Powassan and Langat TP-21 viruses and with the Skalica strain of TBE virus.