Tests failed to pin the outbreak, which has since waned, on common pig viruses. (sciencenews.org)
When given to ferrets, it produces a disease whose symptoms are all but identical to the Iowan pig virus. (newscientist.com)
After a flood of optimism and investment in the early 1990's, the struggle to overcome host immune response and fears that organs could transmit pig viruses to humans scared off pharmaceutical funders. (sciencemag.org)