The beach and swimming area at Christie Lake Conservation Area has been closed to swimmers and animals, the Hamilton Conservation Authority said in a news release on Friday.

Water samples taken from several spots along the shoreline showed the presence of blue-green algae, confirmed Hamilton Public Health Services.

The naturally occurring algae, known as cyanobacteria, can produce toxins known as microcystins, which are a health risk to humans and animals. It typically forms in shallow, warm and stagnant or slow moving water.

Skin contact with or accidental ingestion of the algae can lead to a number of symptoms including a rash or other skin irritation, red eyes, swollen lips, sore throat, fever, nausea, vomiting and diarrhea.

The Hamilton Conservation Authority says the most serious

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