The other virus that causes herpetic eye disease is herpes simplex type 1, or HSV1. Herpes simplex type 1 is the same virus that causes cold sores on the lips and mouth. In the eye, it usually causes an infection of the cornea called herpes simplex keratitis.
Of the five boroughs, the Bronx is the only one on the U.S. mainland and, with a land area of 42 square miles (109 km 2) and a population of 1,438,159 in 2014, has the fourth largest land area, the fourth highest population, and the third-highest population density.
The remaining 10 zoos all earned nominations for Best U.S. Zoo, but didn't get enough reader votes to make the top 10. Some 600 species of animals call the 265-acre Bronx Zoo in New York home, including guest favorites sea lions and Siberian tigers.