Lyme disease is a bacterial infection that is spread to humans from the bite of the deer tick. Most Lyme disease in the northeastern United States occurs during summer or fall, when the small nymphal ticks are most prevalent. The disease was first reported in the U.S. in 1977 in Old Lyme, Conn. The same disease occurs in many parts of Europe and Asia. In the U.S., most Lyme disease infections occur in the northeastern states, from Virginia to Maine; north-central states, mostly in Wisconsin and Minnesota; and west coast, mainly in the northwest. Other names for Lyme disease include Borreliosis and Bannwarth syndrome.