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.
A quadrivalent vaccine is active against 4 strains of influenza while a trivalent vaccine is active against 3 strains of flu vaccine. Remember from math class: quad = 4 and tri = 3. In the past only trivalent flu vaccine was available; so the vaccine was only active against 3 strains influenza- 2 A-types and 1 B-type.f course, if you can only locate the trivalent vaccine, get it-any flu shot is far better than no flu shot. Next year you will want the upgrade to the quadrivalent for better protection. All travelers should get a flu vaccine. Influenza is the most common infection travelers contract that can be prevented by a vaccine.