| 21. | "We have a really virulent strain, " he said.
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| 22. | Their work included subculturing virulent strains of the tubercle bacillus and testing different culture media.
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| 23. | However, the more virulent strain of HIV-2 could be practical for use in animal models.
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| 24. | Additionally, there is a risk that the weak strain could mutate into a more virulent strain.
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| 25. | Molds and bacteria live on the station, and one particularly virulent strain has corroded Mir's windows.
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| 26. | A virulent strain of flu hit in 1957-1958, when the Asian flu killed 70, 000 Americans.
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| 27. | Scarier still, no one knows whether virulent strains might be lurking in the next mail delivery.
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| 28. | A virulent strain of West Nile virus was isolated from the brains of eleven dead juveniles.
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| 29. | Far from having escaped the Asian flu, China has already been smitten by a virulent strain.
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| 30. | The most virulent strain, like the one in Kikwit, kills about 80 percent of its victims.
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