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 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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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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