1. Molecular Epidemiology and Public Health Laboratory, Hopkirk Research Institute, Massey University, Private Bag, 11 222, Palmerston North 4442, New Zealand.
2. Department of Biology, University of Florida, Gainesville, FL 32611, USA.
3. Emerging Pathogens Institute, University of Florida, Gainesville, FL 32611, USA.
4. Fogarty International Center, National Institutes of Health, Bethesda, MD 20892, USA.
5. Institute of Fundamental Sciences, Massey University, Private Bag, 11 222, Palmerston North 4442, New Zealand.
6. U.S. Geological Survey, Fort Collins Science Center, Fort Collins, CO 80526, USA.
7. Department of Biology, Colorado State University, Fort Collins, CO 80523, USA.