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To investigate whether there is an association between local or systemic IgG and IgA responses against human papillomavirus (HPV) type 16 virus-like particles (VLP) containing L1 and L2 and the possible influence of these responses on clearance of HPV-16 and its associated lesions, cervical mucus samples from 125 patients and plasma samples from 100 patients, all participating in a non-intervention cohort study of women with abnormal cytology, were analysed. The results show that local IgG and IgA HPV-16 VLP-specific antibodies do not correlate with virus clearance. However, systemic IgG responses were more frequently detected in patients with a persistent infection (11/24) compared with patients with cleared HPV-16 infections (3/28, P = 0.006). Furthermore, the ultimate development of high-grade lesions was associated with systemic VLP-specific IgG reactivity (P = 0.026). By contrast, systemic IgA responses were correlated with virus clearance (7/28 clearance compared with 1/24 persistence patients, P = 0.06). This correlation was statistically significant when only those clearance patients who tested HPV-16 DNA-positive at more than one visit were included in the analysis (5/11 compared with 1/24, P = 0.007). As these systemic IgA responses were not accompanied by local IgA responses, the systemic IgA responses in HPV-16 clearance patients are suggested to be a by-product of a successful cellular immune response induced at the local lymph nodes, mediated by cytokines.

journal of general virology

Immune responses against human papillomavirus (HPV) type 16 virus-like particles in a cohort study of women with cervical intraepithelial neoplasia. II. Systemic but not local IgA responses correlate with clearance of HPV-16.