The top ten viruses in April 2005 were as follows:
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W32/Zafi-D 46.6%
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W32/Netsky-P 20.6%
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W32/Zafi-B 4.5%
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W32/Netsky-D 4.5%
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W32/Netsky-Z 2.5%
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W32/Netsky-B 2.4%
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W32/Mytob-Z 1.3%
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W32/MyDoom-O 1.2%
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W32/Netsky-C 1.1%
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W32/Netsky-Q 1.0%
Others 14.3%
Source: Sophos.com