In Pictures: Americaâs Safest Cities. Henderson, Nev., takes the No. 2 spot despite its location within the Metropolitan Statistical Area of Las Vegas-Paradise, which ranked ninth this year on Forbesâ list of Americaâs Most Dangerous Cities.
Use in Cancer. Recombinant human papillomavirus (HPV) quadrivalent vaccine is approved to prevent some conditions caused by certain types of HPV. It is used in males or females aged 9 to 26 years to prevent the following: 1  Anal cancer.2  Cervical cancer. 3  Vaginal cancer.4  Vulvar cancer.ecombinant human papillomavirus (HPV) quadrivalent vaccine is approved to prevent some conditions caused by certain types of HPV. It is used in males or females aged 9 to 26 years to prevent the following: 1  Anal cancer. 2  Cervical cancer. 3  Vaginal cancer. 4  Vulvar cancer.
Influenza vaccines come in two levels of protection: Trivalent and Quadrivalent. As their names suggest, Trivalent vaccines protect against three strains of flu virus whereas Quadrivalent vaccines protect against four strains of flu virus. Trivalent flu vaccines protect against influenza type A subtype H1N1 strain, influenza type A subtype H3N2 strain, and one influenza type B strain. Quadrivalent flu vaccines protect against influenza Type A subtype H1N1 strain, influenza Type A subtype H3N2 strain, and two influenza type B strains.