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Immunohistochemistry with the anti-HPV-6 E1^E4 antibody. (a) HPV-6-infected LP, (b) HPV-6-infected nasoseptal exophytic papilloma, (c) HPV-negative LP, (d) HPV-negative paranasal exophytic papilloma, (e) normal vocal cord, and (f) chronic tonsillitis. Bars = 100 μm. Nasoseptal exophytic papilloma (b) with HPV-6 infection had a significantly lower HPV-6 viral load than the positive cases.
