1. Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA 02543 USA
2. Department of Organismic and Evolutionary Biology Harvard University Cambridge MA 02138 USA
3. Department of Cellular Biology and Center for Tropical and Emerging Global Diseases University of Georgia Athens GA USA
4. Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine Washington State University Pullman WA USA
5. Parasitology and Animal Diseases Department, National Research Center Giza Egypt