Acknowledgments

I am grateful to Barbara Ellis and Nita Madhav for preparation of graphics for the manuscript. Darin Carroll and Barbara Ellis provided valuable critiques of the manuscript. I am indebted to Charlie Calisher, Ken Abbott, Terry Yates, Rick Douglass, Amy Kuenzi, Mike Morrison, Gladys Calderón, Delia Enría, and the many other individuals who contributed to the collection of these data at Colorado State University, Yavapai College, the University of New Mexico, The University of Arizona, Montana Tech of the University of Montana, and the Instituto Nacional de Enfermedades Virales Humanas, "Dr. Julio Maiztegui", Pergamino, Argentina.

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