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Human papillomavirus type 6 (HPV-6) E2, E4, E6, E7, and L1 antibody levels (median fluorescence intensity [MFI], mean ± standard deviation) among pregnant mothers in their third trimester at the baseline of the study, separately for seropositive and seronegative women. Cut-off for L1 seropositivity was MFI ≥200. Cut-off for E2, E4, E6, and E7 seropositivity was MFI ≥100. Abbreviation: n = number of the mothers stratified by their human papillomavirus serostatus.
