| 21. | An agent-specific nucleic acid has not yet been identified, and the infected host does not elicit an antibody response.
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| 22. | I thought it happened when they bit already-infected hosts .-- Talk 08 : 54, Jul 20, 2004 ( UTC)
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| 23. | The leaves will drop upon reaching a premature stage, and the defolication of the infected host will cause further infection.
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| 24. | This is because it has adapted to living in the dry mucous membranes of an infected host's upper respiratory tract.
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| 25. | The parasite escapes from the liver undetected by wrapping itself in the cell membrane of the infected host liver cell.
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| 26. | This is the median number of parasites found in infected hosts ( the zeros of uninfected hosts are excluded ).
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| 27. | "H . nana "'s larval stage occurs either inside an auto infected host's intestinal villus or an intermediate rat host.
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| 28. | This is the mean number of parasites found in the infected hosts ( the zeros of uninfected hosts are excluded ).
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| 29. | This was the first occurrence of acquiring a new form of malaria through its vector instead of an infected host specimen.
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| 30. | The disease is caused by a bacterium usually transmitted by the bite of fleas from an infected host, often a black rat.
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