Twelve patients treated by two British GPs who have been diagnosed with coronavirus are being traced by health officials, the BBC understands.
Between them, the two doctors worked in four different places in East and West Sussex – a nursing home, an A&E department and two GP practices.
A British man linked to 11 cases of coronavirus has now left hospital and returned home.
NHS England said Steve Walsh posed “no risk to the public”.
Mr Walsh, 53, from Hove, said he was happy to be home and feeling well.
“I want to give a big thank you to the NHS who have been great throughout, and my thoughts are with everyone around the world who continues to be affected by the virus,” he said.
“It’s good to be back with my family and I would ask you please to respect our privacy from this point on.”
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Mr Walsh had mild symptoms and was discharged from a specialist infectious diseases unit at Guy’s and St Thomas’ NHS Foundation Trust in London after making a full recovery.
He was infected by the new coronavirus after attending a business conference in Singapore in January.
A total of 1,750 people have now tested negative for the new virus in the UK, with eight positive.
The GP practices in Brighton where they worked have now reopened after a deep clean.
Worthing Hospital, where one of the GPs worked a shift in A&E, continues to operate as normal, a Department of Health spokeswoman said.
A Brighton nursing home – Patcham Nursing Home – has closed to visitors as a precaution, but nobody there is reported to be unwell.
One of the Brighton doctors has been named as Catriona Greenwood. The second GP has not been named.
On Tuesday, the World Health Organization said the official name for the disease caused by the coronavirus is Covid-19.
Prof Neil Ferguson, infectious disease expert from Imperial College London, told the BBC that he thought new cases of the virus could still rise.
“I think we’re in the early phases of a global pandemic at the moment,” he said.
Prof Ferguson added it was likely that only one in three cases coming into the UK was being picked up.
But John Oxford, emeritus professor of virology at Queen Mary University London, said he thought the virus had a weakness – and people’s actions could help slow transmission.
“It’s not about wearing a mask – it’s less of the hand-shaking, touching and kissing,” he said, speaking on the Today programme.