Those heading to the beach this week are advised to stay out of the water as several beaches are under advisory for excessive bacteria levels. Eight beach areas have been placed under warnings for bacteria levels by the Los Angeles County Public Health department. These areas are under advisory, which means the “ocean’s water bacteria levels exceed state standards and may cause illness.” Those with weakened immune systems, along with children and the elderly, are most at risk officials said. … The exact cause of the heightened bacteria is not known, but officials say runoffs from rainstorms can also contaminate waters.

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