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infective agent |
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cattle aged 20 months or less, and then only if packers remove brains, spinal columns and nervous tissue regarded most at risk of carrying the infective agent for BSE. This result bolsters the theory that one rogue cell line was the original infective agent, Pearse says. Each infective agent has its own virulence, and each individual has his/her own `host factors' which determine that person's susceptibility to infection. |
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