By Dr. Neal R. Chamberlain at A. T. Still University of Health Sciences/Kirksville College of Osteopathic Medicine, Department of Microbiology/Immunology, Kirksville, MO, U.S.A.
Links for Viroids:
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http://www.atsu.edu/faculty/chamberlain/Website/Lects/Prions.htm
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Viroids are the smallest infectious pathogens known, consisting solely of short strands of circular, single-stranded RNA without protein coats. By Wikipedia.
https://en.wikipedia.org/wiki/Viroid -
By Dr. Michael T. McManus, University of California San Francisco.
http://mcmanuslab.ucsf.edu/node/246
