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At least 400 Florida beach-goers were stung by jellyfish over the weekend.

No one was seriously injured, and lifeguards treated the stings with vinegar.

The swarm is actually not something new for the area, said Volusia County Beach Safety Captain Tammy Marris. She said the county beaches see this size of a swarm about a dozen times a year.

"Jellyfish and anything in the water are at the mercy of the current and the winds," Marris told USA TODAY Network.

The most recent jellyfish swarm arrived Friday, with the majority along New Smyrna Beach, she said.

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A state police helicopter spotted a great white shark about 75-100 yards off a Massachusetts beach Monday. The beach was shut down for about an hour as a precautionary measure. VPC

Volusia County Beaches officials raised purple and yellow flags along the beaches due to the "increased marine pests," says the county's Facebook page.

It appears the jellyfish have been carried back out to the ocean. There were only four reports of jellyfish stings on Monday, Marris said.

Jellyfish sting with their tentacles. Although the stings generally are not severe, in rare cases, they can be life-threatening, according to the National Science Foundation.

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