Authorities have told a group of residents living near a metropolitan Adelaide beach to close their doors and windows to prevent symptoms related to South Australia's ongoing algal bloom.

Chief Public Health Officer Nicola Spurrier told a press conference on Thursday that she had spoken to residents at Henley Beach who "can't move away from the beach" about actions they could take to avoid feeling the impact of algae aerosols.

She said everyone was in a "slightly different situation" and ruled out further changes to health advice as she addressed journalists at the weekly algal bloom task force update.

"Surfers totally addicted to surfing, they're not going to stay out of the water … they're going to be totally fine and wash it off and go back in tomorrow," Professor Spurrier said.

"So

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