Table 1. Seasonal variation in estimated hosts density, Ixodes ricinus larval abundance, prevalence (Prev) of infection and contribution (Cont.) to the acarological risk of Borrelia burgdorferi genospecies for the different rodent host species between 2007 and 2010 on the Sénart Forest (France).
| Species | Year | Seasons | Host density | I. ricinus larvae | B. burgdorferi s.s. | B. afzelii | B. garinii | |||
| Prev. | Cont. | Prev. | Cont. | Prev. | Cont. | |||||
| Siberian chipmunks | ||||||||||
| 2007 | Spring | 2 [2]–[3] | 0.5 [0.3–0.6] | 9 [4]–[21] | <0.1 | 22 [12]–[39] | <0.1 | 0 | – | |
| Summer | 8 [7]–[9] | 28.6 [22.1–37.0] | 7 [3]–[15] | 2.0 [0.9–4.4] | 10 [6]–[18] | 3.0 [1.6–5.9] | 0 | – | ||
| Autumn | 3 [3]–[4] | 23.6 [16.7–33.5] | 16 [7]–[37] | 1.7 [0.7–4.5] | 33 [17]–[57] | 3.4 [1.5–7.1] | <0.1 | 0 | ||
| 2008 | Spring | 2 [1]–[3] | 0.2 [0.2–0.3] | 8 [4]–[18] | <0.1 | 12 [6]–[22] | 0 | <0.1 | 0 | |
| Summer | 5 [4]–[6] | 13.0 [9.8–17.3] | 6 [3]–[14] | 0.5 [0.2–1.2] | 5 [3]–[10] | 0.5 [0.2–0.9] | 0 | – | ||
| Autumn | 5 [4]–[7] | 10.8 [7.5–15.6] | 15 [6]–[34] | 1.1 [0.4–2.8] | 19 [10]–[35] | 1.4 [0.6–3.0] | <0.1 | 0 | ||
| 2009 | Spring | <1 | 0.4 [0.3–0.6] | 2 [1]–[7] | <0.1 | 37 [19–63] | 0 | <0.1 | 0 | |
| Summer | 2 [1]–[3] | 26.0 [18.3–36.9] | 1 [0–5] | 0.1 [0.0–0.4] | 18 [10]–[34] | 1.1 [0.5–2.5] | 0 | – | ||
| Autumn | 2 [1]–[3] | 21.5 [14.1–32.8] | 4 [1]–[14] | 0.2 [0.1–0.9] | 52 [27]–[8] | 2.8 [1.3–5.9] | <0.1 | 0 | ||
| 2010 | Spring | <1 | 0.9 [0.6–1.4] | 6 [1]–[23] | <0.1 | 4 [1]–[11] | <0.1 | 0 | – | |
| Summer | 4 [3]–[5] | 53.8 [35.5–81.5] | 4 [1]–[17] | 1.1 [0.2–5.1] | 2 [1]–[5] | 0.5 [0.2–1.2] | 0 | – | ||
| Autumn | 7 [5]–[10] | 44.5 [27.6–71.8] | 10 [2]–[40] | 2.8 [0.6–10.3] | 7 [2]–[17] | 1.8 [0.6–5.0] | 0 | – | ||
| Bank voles | ||||||||||
| 2007 | Spring | 5 [1]–[10] | 1.1 [0.7–1.4] | 0 | – | 24 [16]–[35] | 0.2 [0.1–0.6] | 0 | – | |
| Summer | 12 [6]–[18] | 5.6 [3.9–8.1] | 0 | – | 23 [16]–[33] | 2.8 [1.5–4.8] | 0 | – | ||
| Autumn | 9 [3]–[15] | 1.8 [1.1–3.2] | 0 | – | 17 [10]–[28] | 0.5 [0.1–2.0] | 0 | – | ||
| 2008 | Spring | 5 [3]–[11] | 0.4 [0.2–0.7] | 0 | – | 8 [3]–[19] | <0.1 | 0 | – | |
| Summer | 12 [10]–[21] | 1.1 [0.7–1.4] | 0 | – | 3 [1]–[9] | 0.1[0.0–0.2] | 0 | – | ||
| Autumn | 34 [27]–[46] | 0.7 [0.4–1.4] | 0 | – | 7 [2]–[21] | 0.3 [0.1–0.9] | 0 | – | ||
| Wood mice | ||||||||||
| 2007 | Spring | 8 [3]–[13] | 1.4 [0.4–3.5] | 0 | – | 0 | – | 0 | – | |
| Summer | 12 [6]–[18] | 15.4 [6.3–38.2] | <0.1 | <0.1 | 12.5* | 3.4 [3.4–62.0] | 0 | – | ||
| Autumn | 0 | – | – | – | – | – | – | – | ||
Note: B. garinii includes B. bavariensis; Host density (estimation): number of individuals per hectare; I. ricinus larvae (estimation): mean number of larvae per individual; Prev. (estimation): mean percentage of infected individuals; Cont. (estimation): contribution in number of infected nymphs per hectare per day; *: observed prevalence; in brackets: confidence intervals at 95%.