NHS West Essex has urged people with swine flu symptoms not to turn up at their GP practice.
The PCT has also said potential sufferers should not visit the walk-in centre in Harlow, A&E or their local pharmacy unless told to do so.
People concerned they may have swine flu should ring the national Swine Flu Information Line on 0800 1 513 513 or NHS Direct on 0845 46 4) or visit the NHS Choices website nhs.uk.
If, after doing this, people are still concerned they should stay at home and phone their GP.
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