The History of Terrorism
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viscerotropic
Children
Theiler and Smith,29 at the Rockefeller Institute, subsequently found that serial passage of wild-type virus in chick embryos resulted in a viral strain attenuated in both viscerotropic and neurotropic activity.
This approach proved problematic, however, because serial passage in mouse brain tissue attenuated viscerotropic virulence but the virus became more neurotropic.