Do vitamin D levels affect antibody titers produced in response to HPV vaccine?

In addition to its well-known effects on bone metabolism, vitamin D is an immunomodulating hormone. Serum vitamin D levels in males 18–25 years were measured at baseline, and HPV antibody titers were measured one month following the third quadrivalent HPV vaccine dose. Vitamin D levels were ≥30 ng/ml (normal) in 60 males and <30 ng/ml (low) in 113 males. Reverse cumulative distribution curves and scatter plots showed higher antibody titers with...