Abstract:
:Although licensed human papillomavirus (HPV) vaccines are most efficacious in persons never infected with HPV, they also reduce infection and disease in previously infected subjects, indicating natural immunity is not entirely protective against HPV re-infection. The aim of this exploratory study was to examine the B cell memory elicited by HPV infection and evaluate whether vaccination merely boosts antibody (Ab) levels in previously infected subjects or also improves the quality of B cell memory. Toward this end, the memory B cells (Bmem) of five unvaccinated, HPV-seropositive subjects were isolated and characterized, and subject recall responses to a single HPV vaccine dose were analyzed. Vaccination boosted Ab levels 24- to 930-fold (median 77-fold) and Bmem numbers 3- to 27-fold (median 6-fold). In addition, Abs cloned from naturally elicited Bmem were generally non-neutralizing, whereas all those isolated following vaccination were neutralizing. Moreover, Ab and plasmablast responses indicative of memory recall responses were only observed in two subjects. These results suggest HPV vaccination augments both the magnitude and quality of natural immunity and demonstrate that sexually active persons could also benefit from HPV vaccination. This study may have important public policy implications, especially for the older 'catch-up' group within the vaccine's target population.
journal_name
EBioMedicinejournal_title
EBioMedicineauthors
Scherer EM,Smith RA,Gallego DF,Carter JJ,Wipf GC,Hoyos M,Stern M,Thurston T,Trinklein ND,Wald A,Galloway DAdoi
10.1016/j.ebiom.2016.06.042subject
Has Abstractpub_date
2016-08-01 00:00:00pages
55-64issn
2352-3964pii
S2352-3964(16)30299-7journal_volume
10pub_type
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