Table 1. Spatial and temporal variation in the occurrence and distribution of Ehrlichia phagocytophila-human agent (EP-ha) and E. phagocytophila variants, Connecticut and Rhode Island, 1996–1999.
| Collection site | Year | No. | Adult | Nymph | No. of PCR-positive ticks (%) | No. of PCR products sequenced | Proportion infected with— |
|||
|---|---|---|---|---|---|---|---|---|---|---|
| EP-ha | Variant 1 | Variant 2 | ||||||||
| Bridgeport, CT | 1996 | 30 | + | 7 | (23.3) | 7 | 100% | |||
| 1997 | 60 | + | 7 | (11.7) | 7 | 100% | ||||
| 1998 | 82 | + | 5 | (6.1) | 5 | 100% | ||||
| 1998 | 101 | + | 19 | (18.8) | 19 | 100% | ||||
| 1999 | 102 | + | 12 | (11.8) | 12 | 100%a | 8.3%a | |||
| Bluff Point, CT | 1997 | 79 | + | 9 | (11.4) | 9 | 55.6% | 44.4% | ||
| South Kingstown, RI | 1996 | 31 | + | 5 | (16.1) | 5 | 60% | 40% | ||
| 1997 | 112 | + | 52 | (46.4) | 30 | 10% | 3.3% | 86.7% | ||
| 1997 | 120 | + | 46 | (38.3) | 37 | 13.5% | 13.5% | 73% | ||
| 1998 | 91 | + | 5 | (5.5) | 5 | 20% | 80% | |||
| 1999 | 103 | + | 5 | (4.9) | 5 | 80% | 20% | |||
| 1999 | 81 | + | 10 | (12.3) | 10 | 80% | 20% | |||
aIncludes one tick that was positive for both the human granulocytic ehrlichiosis agent and variant 1. PCR = polymerase chain reaction.