Hospitals have issued a warning about a spread in norovirus across the county.
Visitors are urged to take precautions to try to stop the vomiting bug infecting patients on the wards.
University Hospitals Sussex NHS Foundation Trust has also urged people with planned procedures to alert the hospital if they have been unwell beforehand.
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A trust spokesman said: "Norovirus is in the community so for all visitors to our hospitals, please wash your hands with soap and water before visiting and leaving the wards.
"Do not visit our hospitals if you have had any kind of sickness and/or diarrhoea until 48 hours after your last symptoms.
"If you are due to come into hospital for a procedure and have been unwell, please call before you come in. Thank you for your support in helping us to help you."
Common symptoms of the bug include vomiting, diarrhoea, a high temperature and a headache.
The NHS said these symptoms should ease after a few days.
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