The following are factors that may determine whether swimmer's itch may be a problem on a specific lake at a given time:

  1. distribution and number of snails that can serve as intermediate hosts
  2. distribution and number of bird hosts that can serve as hosts for the adult worm
  3. wind direction
  4. water currents
  5. number of hours that people stay in the water
  6. time of day
  7. sensitivity of the individual to swimmer's itch.

All of these factors can change on an annual basis.

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