The European Medicines Agency has concluded that the human papillomavirus (HPV) vaccine given to teenage girls to protect against cervical cancer does not cause two syndromes linked to severe pain, fainting and migraines. "The available evidence does not support a link" between the vaccines and the syndromes, said Enrica Alteri, who heads human medicines evaluation at the agency. "There is no reason to change the way the vaccines are used." Public health officials say the vaccines can effectively thwart HPV, which can lead to cervical cancer. The virus is responsible for about 5% of cancer cases globally, Alteri noted. Approximately 80 million girls and women worldwide have been vaccinated against different HPV strains. There are two vaccines: GlaxoSmithKline markets Cervarix and Merck sells Gardasil.