The HPV virus causes genital warts through sexual contact and has the potential to lead to cervical cancer, which is the second most common cancer in women. Zur Hausen discovered two high-risk types of HPV, which led to the discovery of vaccines against the virus. The vaccine Gardasil was approved in 2006 and protects against most forms of HPV including the two discovered by Hausen. The vaccine is effective for women between the ages of 9 and 26 and it protects against the forms of HPV that are most likely to lead to cervical cancer.
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