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Wards at Eastbourne District General, Royal Sussex County, the Conquest in St Leonards and Chichester's St Richards all hit by bug.
Dozens of hospital patients have been struck down by a highly infectious virus.
Four wards – Chiddingly, Folkington, Jevington and Polegate – were closed to new admissions at Eastbourne District General Hospital after 45 people developed sickness and diarrhoea.
Bosses are urging people not to visit the hospitals if they have recently had the virus and to wait until they have been symptom-free for 48 hours.
Murray Ward, at the Conquest in St Leonards, has also closed after 11 patients became ill.
A spokesman for East Sussex Healthcare NHS Trust said: “Norovirus is highly infectious. The public can help contain the spread of this virus by not visiting friends or relatives in hospital if they are experiencing symptoms.”
The trust hopes to reopen two of the wards today or tomorrow. Royal Sussex County Hospital in Brighton currently has one ward closed to new admissions after six patients became ill.
A bay on one ward at St Richard’s Hospital, Chichester, is also affected.
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