Volume 50, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



We report results of a longitudinal survey designed to determine the importance and the dynamics of , the spirochete responsible for tick-borne relapsing fever in West Africa in rodents and insectivores in a rural area of northern Senegal. A total of 954 animals were caught during bimonthly capture sessions over a two-year period. Positive thick blood smears were recorded in 17.6% of the 740 rodents and 7.3% of the 55 musk shrews tested. Variations of prevalence were analyzed in and , which represented 62.7% and 28.3%, respectively, of the animals captured, and 65.7% and 27.6%, respectively, of the animals found infected. prevalence was significantly different between captures and fluctuated separately for each species. Age-specific prevalence of showed distinct patterns, decreasing with age from 50% in younger juveniles to 3% in older adults for , while increasing with age from 8% to 23% for . No relationship was observed with animal abundance or with the season of the year for either species. These findings suggest that the diversity of the population dynamics of host-vector-parasite associations in the Sahel region of Senegal may be a key factor for the relative stability of the borreliosis reservoir.


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