TICK-BORNE RELAPSING FEVER: AN INTERSTATE OUTBREAK ORIGINATING AT GRAND CANYON NATIONAL PARK

During the 1973 summer season, 27 employees and 35 overnight guests at the North Rim, Grand Canyon National Park, Arizona, acquired febrile illnesses compatible with relapsing fever. Sixteen cases were confirmed by finding Borrelia spirochetes in peripheral blood smears or inoculated Swiss mice. Ret...

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Bibliographic Details
Published in:American journal of epidemiology 1977-05, Vol.105 (5), p.469-479
Main Authors: BOYER, KENNETH M., MUNFORD, ROBERT S., MAUPIN, GARY O., PATTISON, CHARLES P., FOX, MARSHALL D., BARNES, ALLAN M., JONES, WALLIS L., MAYNARD, JAMES E.
Format: Article
Language:English
Subjects:
Adult
Animals
Arizona
Arthropod Vectors
borelia infections
borrelia
Child
Disease Outbreaks - epidemiology
Disease Reservoirs
Ecology
Female
Humans
Male
relapsing fever
Relapsing Fever - epidemiology
Relapsing Fever - microbiology
Relapsing Fever - transmission
spirochete infections
Ticks
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Summary:During the 1973 summer season, 27 employees and 35 overnight guests at the North Rim, Grand Canyon National Park, Arizona, acquired febrile illnesses compatible with relapsing fever. Sixteen cases were confirmed by finding Borrelia spirochetes in peripheral blood smears or inoculated Swiss mice. Retrospective surveys of 278 employees and 7247 guests at the park revealed that acquisition of illness was significantly associated with the persons sleeping in rustic log cabins and acquiring bites of “unknown” insects. From rodent nesting materials found in the walls and attics of cabins where cases had occurred, infective Ornithodoros hermsi ticks were recovered. Exceptional activity of ticks in human populations appeared to have resulted from a decreased population of the ticks' usual rodent hosts. Vector control activities consisted of spraying the cabins with residual insecticide, removing nesting materials, and “rodent proofing.” This outbreak, the largest yet identified in North America, extends the known range of a principal vector and establishes the North Rim as an endemic source of tick-borne relapsing fever.
ISSN:0002-9262
1476-6256
DOI:10.1093/oxfordjournals.aje.a112406