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Titers of HPV-16 VLP IgG antibody for subjects 5 and 7. The visits at which HPV-16 DNA was detected for the second time are indicated by arrows. The first period of HPV-16 DNA detection spanned visits 11 through 13 for subject 5 and visits 4 through 10 for subject 7. The 3-SD cutoff defining positivity was an OD of 0.136.
