1. Center for Vector Biology, Rutgers University , 180 Jones Avenue, New Brunswick, NJ 08901-8536 , USA
2. Tick-Borne Disease Program, Monmouth County Mosquito Control Division , 1901 Wayside Road, Tinton Falls, NJ 07724 , USA
3. National Veterinary Institute , Ulls väg 2B, SE-751 89 Uppsala , Sweden