| 31. | Gerberding expressed hope that the medical sleuths would be able to trace the source of infection quickly.
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| 32. | The search continues for cattle that might have eaten contaminated feed, the most likely source of infection.
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| 33. | Bats are presumed to be the culprit only because all other sources of infection were ruled out.
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| 34. | "We contact-traced all her movements in Singapore and did not find any sources of infection, " he said.
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| 35. | The disease can also be zoonotic, with ruminants and dogs providing the principal source of infection for humans.
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| 36. | These stressed trees can then act as a source of infection by other organisms of nearby healthy trees.
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| 37. | Clearing an infection does not always create immunity if there is a new or continuing source of infection.
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| 38. | In most major outbreaks the source of infection has been water in the air-conditioning systems of large public buildings.
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| 39. | That letter had been considered the likely source of infection for all the anthrax cases in and around Washington.
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| 40. | Officials acknowledged that the source of infections could be cross-contaminated mail, though epidemiologists are pursuing a multitude of theories.
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