The present invention relates to peptides or peptide derivatives of the 65 kD
lower matrix phoshpoprotein of human cytomegalovirus. The peptides disclosed are
useful for determining whether subjects have been exposed to human cytomegalovirus.
Methods for using these peptides or derivatives thereof to determine the peptide-induced
production of interferon- and/or TNF- in CD8+ T cells
isolated from subjects are also disclosed.