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Math Help - 3 log reduction

  1. #1
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    3 log reduction

    Can someone help me calculate a 3 log reduction of microbial growth for efficacy studied of cleaning agents
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by northb View Post
    Can someone help me calculate a 3 log reduction of microbial growth for efficacy studied of cleaning agents
    I'll have a go but currently your question makes little sense. Can you post the full question verbatim please?
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  3. #3
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    I need to determine what a 3 log reduction is for a cleaning validation study I am performing. If I have a known concentration of organism per ml of innoculum, what log reduction would be required to achieve a 95% kill rate


    Quote Originally Posted by e^(i*pi) View Post
    I'll have a go but currently your question makes little sense. Can you post the full question verbatim please?
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  4. #4
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    I'm afraid you will have to explain exactly what a "log reduction" is. I don't believe that is a standard math phrase.
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  5. #5
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    3 log reduction

    "Log reduction" is a mathematical term (as is "log increase") used to show the relative number of live microbes eliminated from a surface by disinfecting or cleaning.

    For example, a "5-log reduction" means lowering the number of microorganisms by 100,000-fold, that is, if a surface has 100,000 pathogenic microbes on it, a 5-log reduction would reduce the number of microorganisms to one.

    Log Reductions


    • 1 log reduction means the number of germs is 10 times smaller
    • 2 log reduction means the number of germs is 100 times smaller
    • 3 log reduction means the number of germs is 1000 times smaller
    • 4 log reduction means the number of germs is 10,000 times smaller
    • 5 log reduction means the number of germs is 100,000 times smaller
    • 6 log reduction means the number of germs is 1,000,000 times smaller
    • 7 log reduction means the number of germs is 10,000,000 times smaller
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