Like many STDs, genital HPV infections often do not have visible signs and symptoms. One study sponsored by the National Institute of Allergy and Infectious Diseases (NIAID) reported that almost half of the women infected with HPV had no obvious symptoms.
Quick Answer. The United States Census splits the country into four regions: northeast, midwest, west and south. Of these regions, as of 2013 the south has the largest total population with more than 118 million inhabitants or 37.4 percent of the country's total population. Continue Reading.
Demography of the United States. The United States is estimated to have a population of 323,127,513 as of July 1, 2016, making it the third most populous country in the world. It is very urbanized, with 81% residing in cities and suburbs as of 2014 (the worldwide urban rate is 54%).