Merck and CSL Limited are expected to market Gardasil as a cancer vaccine, rather than an STD vaccine. In the early years of Gardasil's introduction it was unclear how widespread the use of the three-shot series would be, in part because of its $525 list price ($175 each for three shots). But as of 2013, vaccine coverage has been rising. In 2013, about 55% of girls ages 13–17 years had at least one dose of the vaccination covered, up from 29% in 2007. Coverage for women ages 18–34 also has increased significantly since 2007.