Skip Navigation


Author(s): Wah Chiu, PhD, and Matthew Dougherty, MS. Slides: Sonia Rahmati Clayton, PhD, and Colleen Krockenberger, BS.

What are Viruses?

Transcript from "Viruses," National Center for Macromolecular Imaging, NIH.

Viruses have always lived alongside us. They've killed many millions of us. Despite their enormous power to cause disease, they're dependent on us. Invisible and deceitful, viruses are microscopic parasites. Without a host, they cannot reproduce. As scientists discover the chemical rules by which each virus plays, they can control how a virus affects us.

Additional Virus Information

Calici viruses have been identified in humans, other primates, cattle, mink, swine, dogs, chickens, cats, and others. Calici causes a common gastroenteritis that is rarely diagnosed due to lack of adequate laboratory tests. Symptoms include acute gastrointestinal problems with more vomiting than diarrhea. 

Funded by the following grant(s)

Virus images courtesy of Wah Chiu, PhD, National Center for Macromolecular Imaging at Baylor College of Medicine. Funding for the images provided by NCMI, NIH.