Synthetic peptides (SPs), 18-29 amino acids long, representing selected sequences of rubella virus (RV) capsid (C) protein were used in lymphocyte proliferation assays to identify antigenic regions recognized by T lymphocytes from healthy RV-reactive adults. Four SPs, C(1-29), C(90-114), C(108-134) and C(255-300), stimulated proliferation of peripheral blood mononuclear cells and RV-specific T-cell lines from the same donors. C(1-29V), an SP analogue containing an RA27/3 RV vaccine strain sequence, stimulated higher levels of proliferation in T cells obtained from RV-vaccinated subjects than did the comparable wild-type (M33 strain) RV sequence.
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