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Our experience as virologists suggests that the use of “good” viruses is common practice. Indeed, studying these new viruses does not end with characterization of their physical properties or disease-causing phenotypes, because many have the potential to be developed into useful biologics with therapeutic benefits to humans. Even for this apparently small group of viruses, many new members are identified each year that need to be characterized, providing seemingly endless opportunities for new research directions. The focus of our research is on single-stranded DNA viruses. It is astonishing that with our more than thirty-five combined years of working in the field of virology, we continue to read on a regular basis about novel emerging viruses infecting species from all three domains of life.
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