| 41. | Ordinary anthrax responds to antibiotics, but there is concern that terrorists might develop resistant strains.
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| 42. | New drug-resistant strains threaten to make it completely incurable.
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| 43. | This allows the drug resistant strains to become dominant.
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| 44. | Experts now agree that treatment has to be mixtures of drugs to fight resistant strains.
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| 45. | Farmers elsewhere are able to learn about crop diseases and resistant strains from the Web.
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| 46. | Apparently the single dose is enough to stop bacterial growth before resistant strains can develop.
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| 47. | Ivermectin injections may be effective in treating resistant strains.
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| 48. | Drug-resistant strains of the bacteria pose a growing danger.
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| 49. | As a result, they'll learn more about resistant strains.
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| 50. | A resistant strain would probably have caused many casualties.
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