“…In the past few years increasing efforts have been made to develop serological tests capable of proving HPV infection. In these tests, three sources of antigens have been utilized: (i) intact or disrupted HPV virions extracted either from HPVinduced lesions (Pfister & zur Hausen, 1978;Baird, 1983;Dillner et al, 1989a;Steele & Gallimore, 1990;Anisimov/t et al, 1990) or from virus-infected xenografts in nude mice (Christensen & Kreider, 1990), (ii) genetically engineered HPV proteins, usually in the form of bacterial fusion proteins (Jenison et al, 1988(Jenison et al, , 1989Jochmus-Kudielka et al, 1989) or expressed as part of a capsid protein of genetically modified phage fd (Mfiller et al, 1990) and (iii) synthetic peptides derived from known sequences of different HPV DNA open reading frames (ORFs) (Cason et al, 1989;Dillner, 1990;Dillner et al, 1989bDillner et al, , 1990Such~.nkov/~ et al, 1990;Miiller et al, 1990).…”