| 41. | In fact, it takes less time to become infective in these mice than BSE does.
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| 42. | The cystacanth stage is long lived and probably remains infective throughout the life of the crab.
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| 43. | Normal sterilization procedures such as boiling or irradiating materials fail to render prions non-infective.
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| 44. | Cercariae, infective larvae, exit the snail and penetrate the skin of an avian host.
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| 45. | In the feces, larvae mature through two stages and become infective as L3 stage larvae.
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| 46. | It is noted that some eggs of this type remain infective in the environment through winter.
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| 47. | The grouse may ingest infective larvae from the heather tips in the summer and early spring.
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| 48. | Others rapidly become non-infective.
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| 49. | The infective stage is the sporozoite which is present in the salivary glands of the vector.
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| 50. | Infective endocarditis is a severe condition which occurs on native as well as on artificial valves.
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