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| Description: There are more than 19 million new STIs in the United States each year, and young people ages 15 to 24 are disproportionately affected, accounting for 50 percent of all new cases. Picture Stats: Views: 423 Filesize: 137kB Height: 513 Width: 968 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=25687 |