**Author details**

Luisa A. Ikner\* and Charles P. Gerba Department of Environmental Science, The University of Arizona, Tucson, AZ, United States of America

\*Address all correspondence to: ikner@arizona.edu

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
