| a cluster of tick-borne infections: association with military training and asymptomatic infections due to rickettsia rickettsii. | during the spring of 1989, 86 members of a military unit from the state of maryland, usa, participated in two-week-long training manoeuvres in the states of arkansas (location fc) and virginia (location faph). acute febrile illnesses due to infections with two tick-borne pathogens, rickettsia rickettsii and ehrlichia sp., were confirmed serologically in 2 initial cases who were admitted to the hospital. a seroepidemiological investigation among unit members found an additional 17 of 109 individu ... | 1992 | 1412666 |
| seroepidemiology of infections due to spotted fever group rickettsiae and ehrlichia species in military personnel exposed in areas of the united states where such infections are endemic. | a prospective, seroepidemiologic study of spotted fever group rickettsiae (sfgr) and ehrlichia infections was done among 1194 us military personnel exposed in a heavily tick-infested area of arkansas in 1990. seroconversion (4-fold) and seroprevalence rates were determined by indirect immunofluorescent antibody assays. seroconversions to sfgr occurred in 30 persons (2.5%), whereas seroconversion to ehrlichia species occurred in 15 (1.3%). the majority of seroconverters did not report symptoms (2 ... | 1995 | 7751702 |
| fort chaffee revisited: the epidemiology of tick-borne rickettsial and ehrlichial diseases at a natural focus. | a retrospective cohort study was conducted among troops training at fort chaffee, arkansas, from may through june 1997, to identify infections caused by tick-borne pathogens. serum samples were tested by ifas for antibodies to selected rickettsia and ehrlichia species and by an investigational eia for spotted fever group rickettsia lipopolysaccharide antigens. of 1,067 guardsmen tested, 162 (15.2%) had antibodies to one or more pathogens. of 93 guardsmen with paired serum samples, 33 seroconvert ... | 2001 | 12653142 |
| antibodies reactive to rickettsia rickettsii among children living in the southeast and south central regions of the united states. | the reported annual incidence of rocky mountain spotted fever in the united states is 2.2 per million, but studies have suggested that human infection with rickettsia rickettsii may be more common. this study estimated the prevalence of antibodies reactive to r rickettsii among children living in the southeastern and south central united states. | 2003 | 12742879 |