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Vaccination information and news.Vaccination is the administration of antigenic material (a vaccine) to stimulate adaptive immunity to a disease. Vaccines can prevent or ameliorate the effects of infection by many pathogens. There is strong evidence for the efficacy of many vaccines, such as the influenza vaccine, the HPV vaccine and the chicken pox vaccine among others. Vaccination is generally considered to be the most effective method of preventing infectious diseases. The material administered can either be live but weakened forms of pathogens (bacteria or viruses), killed or inactivated forms of these pathogens, or purified material such as proteins.