However, significant associations were observed in MSM with anal HPV 16 (with coinfectiondAOR, 10.94, 95% CI, 1.18 to 101.68; withoutdAOR, 4.96, 95% CI, 1.40 to 17.57). Conclusion We found type-specific associations of HPV 6 and 16 seropositivity with prevalent anal HPV infection, but not with prevalent genital HPV infection alone. Anal HPV 6 infection was associated with seropositivity in both MSW and MSM, while anal HPV 16 infection was only associated with seropositivity in MSM. Our data

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... est that, in men, anal HPV infection may be more efficient than genital HPV infection in inducing immune responses. This may have relevance for protective immunity or the lack thereof, conferred by natural infection. Epidemiology poster session 1: STI trends: Mycoplasma genitallium