Fetching details from the dictionary...
athlete's foot
water boatman (esp. species Hesperocorixa distanti)
Asellus hilgendorfi (species of aquatic sowbug)
プールで水虫がうつってしまった。
I caught athlete's foot at the swimming pool.
水虫は市販の薬で治せる場合が多い。
Athlete's foot can often be treated with over-the-counter medicine.
足を清潔に保つことが水虫の予防に効果的だ。
Keeping your feet clean is effective in preventing athlete's foot.