Table 3.

Aggregated data provided by tertiary data sources

Tertiary data source	No. of counties	No. of ticksa	Species identified	Year(s) of data collectionb	Collection method	Host
Stannard and Pietscht 1958	1	4+	Dermacentor variabilis	1951–1954	Field trap	Medium mammal
Bouseman et al. 1990	1 9	72+ 9+	Dermacentor variabilis Ixodes scapularis	1987–1988	Drag, hunter- killed deer	Deer
Nelson et al. 1991	2	204	Ixodes scapularis	(1991)c	Drag	—
Kitron et al. 1992	1	100+	Ixodes scapularis	1988–1989	Hunter-killed deer	Deer
Lepitzki et al. 1992	1	8+	Amblyomma americanum	1983–1984	Field trap	Rabbit
Dennis et al. 1998	35	NA	Ixodes scapularis	1907–1996	Various	Unknown
Jones and Kitron 2000	1	100+	Ixodes scapularis	1990–1997	Drag, field trap	Small mammal
Cortinas et al. 2002	16	16+	Ixodes scapularis	1998–2000	Various	Deer, small mammal
Guerra et al. 2002	6	NA	Ixodes scapularis	1996–1998	Drag, field trap	Small mammal
Yoder and Benoit 2003	1	NA	Amblyomma americanum	1999–2002	Unknown	Unknown
Springer et al. 2014	11	21+	Amblyomma americanum	1930s–2009	Various	Unknown
James et al. 2015	33	NA	Dermacentor variabilis	1998–2011	Unknown	Unknown
Eisen et al. 2016	29	NA	Ixodes scapularis	1907–2015	Various	Unknown

^aNA= the source does not provide exact tick numbers. A ‘+’ indicates that the sources suggested a minimum number of ticks; for example, ‘…ten deer were infested…’, so there were at least 10 ticks.

^bThe data sources provided aggregate data between those years.

^cWe used the year of publication to specify a relative year of collection when none was given.