CDC's Vaccine safety 
Provides fact sheets on various current vaccine safety topics, including HPV.

Global Advisory Committee on Vaccine Safety (GACVS) 
Established in 1999 to respond promptly, efficiently, and with scientific rigour to vaccine safety issues of potential global importance.

Global Vaccine Safety Initiative (GVSI)
Set up to implement the Blueprint strategy. This comprises a framework of eight strategic objectives aimed at enhancing global vaccine safety activities. The strategic objectives focus on building and supporting a systemic approach to vaccine pharmacovigilance in all low- and middle-income countries. 

Institute for Vaccine Safety 
Provides an independent assessment of vaccines and vaccine safety to help guide decision makers and educate physicians, the public and the media about key issues surrounding the safety of vaccines.

National Vaccine Program Office (NVPO)
Site with general information about vaccines and immunisation-related activities at the U.S. federal level.

Infectious Diseases Society of America (IDSA)

Vaccine Adverse Event Reporting System (VAERS)
Maintained by the Center for Biologics Evaluation and Research of the U.S. Food and Drug Administration. The function of VAERS is to receive reports about adverse events, which may be associated with vaccines.

The Vaccine Confidence Project (VCP)
The project, an initiative of the London School of Hygiene & Tropical Medicine, monitors public confidence in immunisation programmes.