| ehrlichiosis in a golf-oriented retirement community. | ehrlichiosis due to ehrlichia chaffeensis usually occurs sporadically or in small clusters, with an annual incidence estimated at 3 to 5 cases per 100,000 population in areas of endemic disease. the putative principal vector is the lone star tick (amblyomma americanum). we investigated an outbreak of ehrlichiosis that occurred in june 1993 among members of a golf-oriented retirement community (community a) in tennessee. the community is densely wooded and borders a wildlife-management area where ... | 1995 | 7616991 |
| ehrlichiosis. | | 1994 | 7983865 |
| ehrlichia chaffeensis infections among hiv-infected patients in a human monocytic ehrlichiosis-endemic area. | manifestations of human monocytic ehrlichiosis (hme), a tick-borne infection caused by ehrlichia chaffeensis, range from asymptomatic disease to fulminant infection and may be particularly severe in persons infected with hiv. we conducted a serologic study to determine the epidemiology of hme in hiv-positive patients residing in an hme-endemic area. we reviewed charts from a cohort of 133 hiv-positive patients who were seen during the 1999 tick season with symptoms compatible with hme (n=36) or ... | 2003 | 14519250 |
| modeling tick-borne disease: a metapopulation model. | recent increases in reported outbreaks of tick-borne diseases have led to increased interest in understanding and controlling epidemics involving these transmission vectors. mathematical disease models typically assume constant population size and spatial homogeneity. for tick-borne diseases, these assumptions are not always valid. the disease model presented here incorporates non-constant population sizes and spatial heterogeneity utilizing a system of differential equations that may be applied ... | 2007 | 17083005 |
| prevalence of ehrlichia chaffeensis and ehrlichia ewingii in ticks from tennessee. | human ehrlichiosis is the second most common tick-borne disease reported in tennessee after rocky mountain spotted fever. two closely related ehrlichiae, ehrlichia chaffeensis and ehrlichia ewingii, are both causative agents of human disease and are transmitted by amblyomma americanum, the lone star tick. prevalence rates and distribution patterns of these pathogens among ticks in tennessee are currently unknown. to understand prevalence and exposure risk of ehrlichia spp., we tested 616 ticks ( ... | 2010 | 19877819 |
| survey of ticks collected from tennessee cattle and their pastures for anaplasma and ehrlichia species. | anaplasma marginale is the causative agent for bovine anaplasmosis (ba) and ehrlichia ruminantium is the causative agent for heartwater, 2 devastating diseases of cattle. ba is common in the united states and frequently reported in western tennessee cattle; however, cases of heartwater are not yet established in the continental united states. because both pathogens are transmitted via the bites of infected ticks, the objective of this study was to survey cattle and pastures for ticks and for eac ... | 2016 | 26348980 |
| molecular identification of ehrlichia species and host bloodmeal source in amblyomma americanum l. from two locations in tennessee, united states. | the current status of tick-borne diseases in the southeastern united states is challenging to define due to emerging pathogens, uncertain tick/host relationships, and changing disease case definitions. a golf-oriented retirement community on the cumberland plateau in tennessee experienced an ehrlichiosis outbreak in 1993, prompting efforts to reduce the local tick population using '4-poster' acaricide devices targeting white-tailed deer (odocoileus virginianus). in 2009, the prevalence of ehrlic ... | 2015 | 25682494 |
| investigating the adult ixodid tick populations and their associated anaplasma, ehrlichia, and rickettsia bacteria at a rocky mountain spotted fever hotspot in western tennessee. | ehrlichiosis and rickettsiosis are two common bacterial tick-borne diseases in the southeastern united states. ehrlichiosis is caused by ehrlichiae transmitted by amblyomma americanum and rickettsiosis is caused by rickettsiae transmitted by amblyomma maculatum and dermacentor variabilis. these ticks are common and have overlapping distributions in the region. the objective of this study was to identify anaplasma, ehrlichia, and rickettsia species associated with questing ticks in a rocky mounta ... | 2017 | 28598270 |