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By improperly handling of the bacteria, or by doing any or all steps of the aseptic technique incorrectly.
You're either probably breathing incorrectly or playing too hard. Slow down and work on technique instead of power.
Riddle Answer
The answer is the word "incorrectly," which is correctly spelled.
The word is "incorrectly."
(If they don't spell it that way, they have still spelled it incorrectly.)