Is the bacteria actually caused by fish or the water? I never knew about this...
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Bacteria is from the fish. In my case, I pulled out a 30" dead koi out of someones pond to dispose. My middle finger tip swelled up 2 days later which cleared on it's own in two weeks. Two weeks later, top of my hand developed a big sore larger than a quarter.
For pools, the doctor said it's bacteria from people living in the under treated water.