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 borough was a part of Westchester county until 1898, when it was incorporated in the city of New York. Although the Bronx is primarily residential, much of its waterfront (more than 80 miles [130 km]) is used for shipping, warehouses, and industry (textiles, foods, machinery, and paper products).