Rickettsiae in Gulf Coast Ticks – Arkansas
By Linda on Apr 28, 2010 in Infections
Full article: http://www.cdc.gov/ncidod/eid/index.htm
Excerpt:
To determine the cause of spotted fever cases in the southern United States, we screened Gulf Coast ticks (Amblyomma maculatum) collected in Arkansas for rickettsiae. Of the screened ticks, 30% had PCR amplicons consistent with Rickettsia parkeri or Candidatus Rickettsia amblyommii.
The Centers for Disease Control and Prevention identified Arkansas as a leading state for the incidence of Rocky Mountain spotted fever (causative agent Rickettsia rickettsii) and reported >15 cases per 1,000,000 persons in 2002 (1). Given the known cross-reactivity of serologic testing results for spotted fever group (SFG) rickettsia, it is unclear if cases outside the natural range of the vectors for R. rickettsii are misdiagnosed, if the pathogen is less virulent than previously suggested, or if additional rickettsiae are responsible for pathogenesis (2).
