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Table 1 The minimum infection rate[42] of Ixodes ricinus ticks at the TBEV foci

From: Prevalence and phylogenetic analysis of tick-borne encephalitis virus (TBEV) in field-collected ticks (Ixodes ricinus) in southern Switzerland

   Number of ticks sampled Positive pools/total pools Adults Nymphs Mix
Site Year Adult Nymph Larva Adult Nymph Mixa MIR LL UL MIR LL UL MIR LL UL
Raron 2010 875 872 2 11/135 0/45 2/21 1.26 0.63 2.24 0.00 0.00 0.42 0.74 0.39 1.27
Salgesch 2010 271 218 0 0/11 1/6 0/0 0.00 0.00 1.35 0.46 0.01 2.53 0.20 0.01 1.13
Lufu-Niedergesteln 2011 38 66 0 1/2 1/2 0/0 2.63 0.07 13.81 1.52 0.04 8.16 1.92 0.23 6.78
Raron 2011 156 124 0 2/30 0/8 0/0 1.28 0.15 4.55 0.00 0.00 2.93 0.71 0.08 2.56
Rittergut-Visp 2011 73 10 0 2/6 0/1 0/0 2.74 0.33 9.55 0.00 0.00 30.85 2.41 0.29 8.44
Salgesch 2011 320 1012 0 1/38 2/23 0/0 0.31 0.01 1.73 0.2 0.02 0.72 0.23 0.05 0.66
Brig 2013 397 213 1 1/19 0/4 0/1 0.25 0.01 1.40 0.00 0.00 1.72 0.16 0.01 0.91
Pletschen_Susten 2013 7 2 0 0/0 0/0 1/1 0.00 0.00 40.96 0.00 0.00 84.19 11.11 0.28 48.25
Raron 2013 261 239 0 0/14 0/6 1/1 0.00 0.00 1.40 0.00 0.00 1.53 0.20 0.01 1.11
Salgesch 2013 222 434 6 1/14 1/9 0/1 0.45 0.01 2.49 0.23 0.01 1.28 0.30 0.04 1.09
Total   2620 3190 9 19/269 5/104 4/25 0.73 0.44 1.13 0.16 0.05 0.36 0.48 0.32 0.7
  1. LL = lower 95% confidence limit.
  2. UL = upper 95% confidence limit.
  3. amixture of adults, nymphs and larvea.
  4. For each of the ten combinations of site and year, the tick sample sizes are shown for each stage (adult, nymph, larva). The proportion of TBEV-positive pools is shown for pools of three different stage compositions: adults, nymphs, and mixture (adults, nymphs, larvae). The MIR is shown separately for adults, nymphs, and mixture (adults, nymphs, larvae). The MIR and the 95% confidence limits are expressed as a percent.