Hong Kong Chinese speaking men who have sex with men completed a baseline survey, and then received an online intervention promoting uptake of Human Papillomavirus (HPV) vaccination. All participants are followed up by telephone 12 months after the completion of baseline survey.

The primary objective of this study is to investigate prevalence of uptake of Human Papillomavirus (HPV) vaccination after exposure to health promotion among men who have sex with men in Hong Kong within a 12-month project period.

Inclusion criteria are Hong Kong Chinese speaking males aged 18-45 years old and self-reported having had oral or anal intercourse with at least one man in the last six months. Those who have ever received HPV vaccination are excluded.

Participants are recruited through outreaching in gay venues, online advertisement and referral made by peers and non-governmental organization. With verbal informed consent, participants completed a baseline survey through telephone. They are then exposed to online interventions including: 1) watching an online video, 2) receiving a discount coupon to receive HPV vaccination at collaborative private clinics, 3) visiting the project webpage, and 4) receiving follow-up reminders 1, 2, 4, 6, and 8 months after the baseline survey.

All participants are followed up by telephone 12 months after the baseline survey to access the primary outcome.

Inclusion Criteria:

• Hong Kong Chinese speaking males aged 18-45 years old and self-reported having had oral or anal intercourse with at least one man in the last six months

Exclusion Criteria:

• Have received any HPV vaccination

Based on gender identity