FIG. 1.

County map of Texas (696,241 km²). HF, Hansford; MO, Moore; PT, Potter; GY, Gray; DF, Deaf Smith; RD, Randall; DY, Donley; PM, Parmer; CS, Castro; SW, Swisher; HL, Hall; BA, Bailey; LA, Lamb; HA, Hale; CT, Cottle; HQ, Hockley; LU, Lubbock; CB, Crosby; DK, Dickens; GS, Grayson; LY, Lynn; DN, Denton; CL, Collin; HU, Hunt; MX, Morris; GA, Gaines; TR, Tarrant; HW, Howard; TA, Taylor; JN, Johnson; EP, El Paso; LV, Loving; NA, Nacogdoches; AG, Angelina; JD, Jeff Davis; BS, Brewster; KM, Kimble; MS, Mason; KR, Kerr; TV, Travis; HR, Harris; OR, Orange; JF, Jefferson; GV, Galveston; BO, Brazoria; JK, Jackson; MG, Matagorda; DM, Dimmit; LS, La Salle; KL, Kleberg; HG, Hidalgo. The eastern and western halves of the Chaparral Wildlife Management Area were located in western LS and eastern DM counties, respectively. The rodents that were positive for anti-hantavirus antibody in previous studies (Torrez-Martinez et al. 1998, Mantooth et al. 2001, Mauldin et al. 2013, Pitts et al. 2013) were from CT, LU, DK, GS, DN, CL, MX, JD, BS, KM, MS, KR, OR, JF, GV, BO, MG, and LS counties; the rodents that were positive for anti-hantavirus antibody in this study (Table 1) were from DY, HL, LU, LY, JN, JD, KR, and DM counties; and the 32 rodents tested for hantaviral RNA in this study were from CT, LU, LY, MX, JD, KR, GV, BO, MG, and DM counties. The 46 laboratory-confirmed cases of hantavirus pulmonary syndrome in Texas through April 2016 were reported from 29 counties: HF (n = 1), PT (n = 1), GY (n = 1), DF (n = 1), RD (n = 6), PM (n = 2), CS (n = 3), SW (n = 1), LA (n = 1), HA (n = 2), HQ (n = 1), LU (n = 2), CB (n = 2), HU (n = 1), GA (n = 3), TR (n = 1), HW (n = 1), TA (n = 1), EP (n = 2), AG (n = 1), TV (n = 1), HR (n = 2), OR (n = 1), JF (n = 3), BO (n = 1), JK (n = 1), MG (n = 1), KL (n = 1), and HG (n = 1) (Texas Department of State Health Services, unpublished data).