Final answer:
Acanthamoeba, found in lakes, can cause eye infections like keratitis, especially if swimming with contact lenses.
Explanation:
Acanthamoeba is a pathogen that can be found in lakes and can cause eye infections like keratitis when proper precautions are not taken, such as swimming while wearing contact lenses. This protozoan amoeba is common in unchlorinated bodies of fresh water and poses a risk, especially to contact lens wearers, if not properly managed.
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