Fig. 1

Ixodes scapularis ticks were collected across New York State (‘New York’) during a time period in which tick populations were growing and expanding. A Geographic distribution of the 277 ticks collected in New York. The year in which samples were collected is denoted by the shape of the symbol, with squares, circles, triangles and crosses indicating ticks collected in 2004, 2008, 2013 and 2017, respectively. The size of the symbol corresponds to the number of ticks analyzed from a given site. The ticks analyzed represent a stratified random sample from five color-coded regions within New York. I. scapularis ticks were not collected during all study years from the following counties: Lewis, Franklin, Broome, Nassau, Suffolk and Cortland. B Distribution of samples collected per year