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Seroepidemiology of la Crosse Virus Infection in Humans in Western North Carolina
Daniel E. Szumlas
Daniel E. Szumlas
Department of Entomology, North Carolina State University, Health Effects Research Laboratory, U.S. Environmental Protection Agency, Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Raleigh, North Carolina
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Charles S. Apperson
Charles S. Apperson
Department of Entomology, North Carolina State University, Health Effects Research Laboratory, U.S. Environmental Protection Agency, Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Raleigh, North Carolina
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Phillip C. Hartig
Phillip C. Hartig
Department of Entomology, North Carolina State University, Health Effects Research Laboratory, U.S. Environmental Protection Agency, Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Raleigh, North Carolina
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D. Bruce Francy
D. Bruce Francy
Department of Entomology, North Carolina State University, Health Effects Research Laboratory, U.S. Environmental Protection Agency, Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Raleigh, North Carolina
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Nick Karabatsos
Nick Karabatsos
Department of Entomology, North Carolina State University, Health Effects Research Laboratory, U.S. Environmental Protection Agency, Division of Vector-Borne Infectious Diseases, Centers for Disease Control and Prevention, Raleigh, North Carolina
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On the Cherokee Indian Reservation and surrounding area of western North Carolina, an area-wide serosurvey was conducted to determine the prevalence of neutralizing antibody to La Crosse (LAC) virus. A questionnaire was used to identify risk factors important in exposure to virus-infected mosquitoes in populations near the reservation. Of 1,008 serum samples tested, 9.6% were positive for LAC virus antibody. For samples solely collected from on (n = 311) or off (n = 697) the reservation, the prevalence of seropositive samples was 20.6% on the reservation and only 4.7% off the reservation. Seropositivity increased directly with age, indicating that transmission of LAC virus was highly endemic. Age and location residence (on versus off the reservation) were significant risk factors for exposure to LAC virus. Persons on the reservation were 5.5 times more likely to have been exposed to LAC virus than were people who reside off the reservation. An additive increase in risk of 1.5 times over each age group was found, so that the oldest age group (≥ 75 years) was 7.5 times more likely to have been exposed to LAC virus than was the youngest age group (< 1–14 years).
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| Past two years | Past Year | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 299 | 77 | 4 |
| Full Text Views | 20 | 3 | 0 |
| PDF Downloads | 24 | 4 | 0 |