Human papillomavirus (HPV) is the most common sexually transmitted infection with most sexually active men and women being exposed to the virus at some point during their lifetime.1,2.
The Great Seal of the United States of America during the war. During the American Civil War, the Union referred to the United States of America and specifically to the national government and the 23 free states and five border states that supported it. The Union was opposed by 11 southern slave states that formed the Confederate States, or the Confederacy..
How many countries are there in the world? Since South Sudan became an independent state on 9 July 2011, there are now 195 independent sovereign nations in the world (including disputed but defacto independent Taiwan), plus about 60 dependent areas, and five disputed territories, like Kosovo.