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Rickettsia in Texas.

L B Elliott1, P V Fournier, G J Teltow

  • 1Microbiological Services Division, Bureau of Laboratories, Texas Department of Health, Austin 78756-3194.

Annals of the New York Academy of Sciences
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Rocky Mountain spotted fever (RMSF) and murine typhus are endemic in Texas, with surveillance identifying infected ticks. Further research is needed to understand the specific rickettsial species and their pathogenicity.

Area of Science:

  • Veterinary Medicine
  • Epidemiology
  • Infectious Diseases

Background:

  • Rocky Mountain spotted fever (RMSF) has been reported in Texas since 1941, with major foci in the north-central and eastern regions.
  • From 1979-1988, 421 RMSF cases were documented, while murine typhus affected 400 individuals, primarily in South Texas.

Purpose of the Study:

  • To summarize the epidemiology of Rocky Mountain spotted fever and murine typhus in Texas.
  • To report on the prevalence of spotted fever group rickettsiae in Texas tick populations.

Main Methods:

  • Analysis of reported human cases of RMSF and murine typhus from 1979-1988.
  • Statewide surveillance of tick populations for spotted fever group rickettsiae since 1976.

Main Results:

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  • Infectivity rates for spotted fever group rickettsiae in ticks included Dermacentor variabilis (5.2%), Amblyomma americanum (7.1%), Rhipicephalus sanguineus (2.9%), and Ixodes scapularis (10.2%).
  • Murine typhus cases were predominantly reported in South Texas, with investigations suggesting a link to cat flea (Ctenocephalides felis) exposure.

Conclusions:

  • Ongoing surveillance is crucial for understanding the distribution and impact of rickettsial diseases in Texas.
  • Further research is necessary to identify specific rickettsial species and assess their pathogenicity in human and tick populations.