Merseyrail said services to Chester would run exclusively from Moorfields over Sunday and Monday.

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Dr Cherry Radford from London's Moorfields Eye Hospital said the chances of contracting the infection were still very low.

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The closure means passengers coming into Liverpool on the Wirral line can get off at Liverpool Central, Moorfields or Lime Street.

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The 30-year-old Saracens player spent the night in Moorfields Eye Hospital before being told scans had revealed no more than "extreme swelling".

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He was due to be transferred to Moorfields Hospital in London for further treatment to an eye injury but has not been seen since.

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But Dr Robert MacLaren, a specialist at Moorfields Eye Hospital who worked on the research, said they did not want to go down that route.

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Peng Tee Khaw, professor of glaucoma and wound healing at Moorfields Eye Hospital in London, told BBC News Online the rats were fed a huge amount of MSG.

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Frank Larkin, a consultant ophthalmic surgeon at Moorfields said there had been a steady decline in the numbers of eyes donated over the last four to five years.

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Chairman, Moorfields NHS Hospital Trust.

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