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Toxic algae blooms have shown up in Lake Mendota near UW-Madison's Memorial Union and the Hoofers Sailing Club pier, according to the university.

The university issued a warning to use caution along the shore and not swim at night when the blooms can't be seen.

The blue-green algae blooms were first spotted Tuesday morning.

The blooms are made of cyanobacteria, which can release toxins that can cause significant harm to humans and animals.

Symptoms of a reaction to the algae blooms include eye, throat, nose or skin irritation, vomiting or diarrhea.

Blooms form when little wind and warm temperatures combine with nutrients in the water, according to Public Health Madison and Dane County.

The Wisconsin Department of Health Services said avoid areas of water that look like paint or pea soup, don't swim or wade through algae, don't fish in the algae-laden water, don't let pets drink water in algae areas, eat the algae or lick it off fur, and shower after swimming, wash hands if in contact with the algae-laden lake water, and wash pets with clean water if exposed.

If you have been exposed to the blue-green algae, call your health care provider or Public Health, 266-4821.