Counties reporting positive for one or both dengue mosquito vector species, as of 2005 Areas vulnerable to dengue fever infection Dengue Vulnerability Number of suspected cases per state STATE Number of suspected cases per state STATE Hawaii 1,782 cases Texas Utah Montana California Arizona Idaho Nevada Oregon Iowa Colorado Kansas Wyoming New Mexico Illinois Ohio Missouri Minnesota Florida Nebraska Georgia Oklahoma Alabama Washington South Dakota Arkansas Wisconsin North Dakota Virginia Maine New York Indiana Louisiana Michigan Mississippi Kentucky Tennessee Pennsylvania North Carolina South Carolina West Virginia Vermont Maryland New Jersey New Hampshire Massachusetts Connecticut Delaware Rhode Island Baja California Sonora Chihuahua Coahuila Nuevo Leon Tamaulipas 1 case 2 cases 7 cases 2 cases 6 cases 35 cases 4 cases 1 case 15 cases 1 case 3 cases 6,836 border region cases 827 in-state cases 12 cases 19 cases 6 cases 3 cases 43 cases 9 cases 90 cases 5 cases 5 cases 23 cases 4 cases 2 cases 7 cases 3 cases 10 cases 54 cases 3 cases 5 cases 84 cases 20 cases 50 cases 50 cases 0 cases 23 cases 28 cases 21 cases *190 cases 208 cases 6 cases 6 cases 49 cases 15 cases 15 cases 206 cases 1 case 12 cases 2 cases 1 case 9,726 cases 3,301 cases 34,138 cases 20,809 cases Dengue Fever Vulnerability in the United States Suspected Dengue Cases Reported from 1995 - 2005* in the U.S. and Northern Mexico, and U.S. Vector Range Dengue Vulnerability Counties reporting positive for one or both dengue mosquito vector species, as of 2005 Areas vulnerable to dengue fever infection *In Aug.-Nov. 2009, 22 confirmed cases of Dengue Fever acquired in Key West, FL were reported. These were the first locally-transmitted infections in Florida in more than 40 years, with more imported cases since then.