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Table 1 Presence of Rickettsia spp. in different tick species attached to mice, voles and shrews collected from five Estonian sites (four mainland and one island counties)

From: Rickettsia spp. in rodent-attached ticks in Estonia and first evidence of spotted fever group Rickettsia species Candidatus Rickettsia uralica in Europe

County in Estonia where the small mammals were collected Tick species attached to small mammalsa
Myodes glareolus (bank vole) Apodemus flavicollis (yellow necked mouse) Sorex araneus (common shrew)
IR IT IP Total (%) IR IT IP Total IR IT IP Total
Järvamaa 21/217 [Rh] 2/16 [CaRub] 0/1 23/234 (9.8%) 2/75 [Rh] 0/6 2/81 (2.5%) 0/10 0/10
Lääne-Virumaa 7/80 [Rh] 1/22 [Rhc] 8/102 (7.8%) 9/83 [Rh] 0/23 0/1 9/107 (8.4%)
Tartumaa 1/23 [Rh] 0/18 0/59 1/100 (1%) 3/32 [Rh] 0/5 0/13 3/50 (6%)
Pärnumaa 28/108 [Rh] 1/13 [CaRub] 0/1 29/122 (23.8%) 8/72 [Rh] 0/12 8/84 (9.5%) 7/21 [Rhd] 7/21 (33.3%)
Saaremaa 8/111 [Rh] 0/1 8/112 (7.1%) 5/140 [Rh] 0/1 5/141 (3.5%)
Total 65/539 (12.1%) 4/70 (5.7%) 0/61 69/670 (10.3%) 27/402 (6.7%) 0/47 0/14 27/463 (5.8%) 7/31 (22.6%) 7/31 (22.6%)
County in Estonia where the small mammals were collected Tick species attached to small mammalsa Overall total
Apodemus agrarius (striped field mouse) Microtus subterranius (pine vole)
IR IT IP Total IR IT IP Total
Järvamaa 25/325 (7.7%)
Lääne-Virumaa 17/209 (8.1%)
Tartumaa 0/1 0/1 0/2 4/152 (2.6%)
Pärnumaa 44/227 (19.4%)
Saaremaa 0/20 0/20 13/273 (4.8%)
Total 0/20 0/20 0/1 0/1 0/2 103/1186 (8.7%)
  1. IR, Ixodes ricinus; IT, Ixodes trianguliceps; IP, Ixodes persulcatus; Rh, Rickettsia helvetica; CaRu, Candidatus Rickettsia uralica
  2. aNumber of Rickettsia-positive ticks/total number of ticks collected at that location. In parenthesis is the percentage of Rickettsia species and detected Rickettsia species in square brackets
  3. bNone of the IR from the same animal tested positive
  4. c1 Rh-positive IT from animal with 1 positive and 1 negative IR
  5. dAll positive from the same animal