MONDAY, July 8, 2019 (HealthDay News) — All 21 beaches along Mississippi’s Gulf Coast are closed for swimming due to a widespread warning about a blue-green algae bloom.

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The bloom is caused by by the opening of the Bonnet Carre spillway in Louisiana, which has brought an “excessive amount of freshwater to the coastline,” according to the Mississippi Clarion Ledger, CBS News reported.

The spillway is expected to close in mid-July and experts believe the algae bloom will then quickly dissipate.

Blue-green algae can cause rashes, stomach cramps, nausea, diarrhea and vomiting. People and their pets should avoid contact with the water, the Mississippi Department of Environmental Quality said in a statement, CBS News reported.

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