1. Department of Environmental Sciences and Center for Vector Biology & Zoonotic Diseases, The Connecticut Agricultural Experiment Station, New Haven, CT
2. Department of Epidemiology of Microbial Diseases, School of Public Health, Yale University, New Haven, CT
3. Department of Entomology and Center for Vector Biology & Zoonotic Diseases, The Connecticut Agricultural Experiment Station, New Haven, CT
4. Rickettsial Zoonoses Branch, Centers for Disease Control and Prevention, Atlanta, GA