The Ecology of Colorado Tick Fever in Rocky Mountain National Park in 1974

II. Infection in Small Mammals

G. S. Bowen Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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R. G. McLean Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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R. B. Shriner Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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D. B. Francy Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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K. S. Pokorny Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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J. M. Trimble Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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R. A. Bolin Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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A. M. Barnes Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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C. H. Calisher Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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D. J. Muth Vector-Borne Diseases Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, Department of Health, Education, and Welfare, P.O. Box 2087, Fort Collins, Colorado 80522

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DOI:
https://doi.org/10.4269/ajtmh.1981.30.490
Volume/Issue:
Volume 30: Issue 2
Page(s):
490–496
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Field studies of Colorado tick fever (CTF) in small mammals in Rocky Mountain National Park (RMNP) in 1974 established that Eutamias minimus and Spermophilus lateralis were the most important hosts for CTF virus and were the source of virus for immature stages of the tick vector, Dermacentor andersoni. Other species (Peromyscus maniculatus, Spermophilus richardsonii, Eutamias umbrinus) are secondary hosts. The intensity of viral activity in rodents varied greatly from locality to locality. Highest rodent infection rates were found to occur in the Moraine Park area of RMNP. Lowest infection rates occurred above 3,290 meters in altitude at Rainbow Curve and on the tundra. The prevalence of infection in rodents was constant from April–July (5–6% of animals captured were viremic) and then declined to 1.7–2.5% in August and September coincident with a decline in nymphal tick ectoparasitism. Many animals were captured which were simultaneously viremic and antibody-positive. Under field conditions, neutralizing antibody seroconversion does not always occur.
Copyright:
Copyright ©1981 by The American Society of Tropical Medicine and Hygiene 1981
Accepted:
08 Aug 1980
|
Published Online:
Mar 1981
Cover The American Journal of Tropical Medicine and Hygiene
The American Journal of Tropical Medicine and Hygiene
Print ISSN:
0002-9637
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