Royal Cornwall Hospitals Trust has launched a major incident plan to deal with high levels of emergency admissions, and a norovirus outbreak.
Two wards have been closed at the Royal Cornwall Hospital in Treliske, and as many as twenty routine operations a day are being postponed.
The trust is advising non-emergency patients to ring before coming to its hospitals.
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Unsettled outlook for the rest of the weekend
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Lifeguards are back patrolling some of the west country's busiest beaches from today for the summer season.