Table 1. Babesia microti infection in nymphal Ixodes ricinus ticks as determined by polymerase chain reaction, eastern Switzerland.
| Sampling point or line | Pool 1 | Pool 2 | Pool 3 | Pool 4 | Pool 5 | No. of pools | No. of ticks |
|---|---|---|---|---|---|---|---|
| B1 | 11 | 11 | 12 | — | — | 3 | 34 |
| B1–2 | 10 | 10 | 10 | — | — | 3 | 30 |
| B2 | 4 | 3 | — | — | — | 2 | 7 |
| B2–3 | 3 | 3 | 3 | — | — | 3 | 9 |
| B3 | 3 | — | — | — | — | 1 | 3 |
| B3–4 | 8a | 8 | — | — | — | 2 | 16 |
| B4 | 1 | — | — | — | — | 1 | 1 |
| B4–C2 | 5 | 5 | 4 | 5 | — | 4 | 19 |
| C1 | 1 | — | — | — | — | 1 | 1 |
| C1–2 | 9 | 9 | 9 | 9 | — | 4 | 36 |
| C2 | 7 | 7 | 5 | — | — | 3 | 19 |
| C2–3 | 5 | 5 | 5 | 5 | 5 | 5 | 25 |
| C3 | 10 | — | — | — | — | 1 | 10 |
| C3–4 | 4 | — | — | — | — | 1 | 4 |
| C4 | 4 | — | — | — | — | 1 | 4 |
| C4–5 | 7 | 6 | — | — | — | 2 | 13 |
| C5 | 8 | 7 | 6 | — | — | 3 | 21 |
| C5–D1 | 8 | 7 | 7 | 8 | — | 4 | 30 |
| D1 | 5 | 5 | 6 | — | — | 3 | 16 |
| D1–2 | 8 | 7 | — | — | — | 2 | 15 |
| D2 | 6 | 6 | — | — | — | 2 | 12 |
| D2–3 | 5 | 5 | 5 | 6 | 6 | 5 | 27 |
| D3 | 4 | — | — | — | — | 1 | 4 |
| D3–4 | 6 | 6 | 5 | — | — | 3 | 17 |
| D4 | 11 | 11 | 10 | — | — | 3 | 32 |
| D4–5 | 3 | — | — | — | — | 1 | 3 |
| D5 | 0 | — | — | — | — | 0 | 0 |
| Total | 64 | 408 |
aPools in bold are positive; dashes represent the absence of further pools.