No human-to-human transmission has been confirmed so far, but Wuhan's health commission has said the possibility "cannot be excluded".
A World Health Organization doctor said it would not be surprising if there was "some limited human-to-human transmission, especially among families who have close contact with one another".
Scientists with the MRC Centre for Global Infectious Disease Analysis -- which advises bodies including the World Health Organization -- said they estimated a "total of 1,723" people in Wuhan would have been infected as of January 12.
"For Wuhan to have exported three cases to other countries would imply there would have to be many more cases than have been reported," Professor Neil Ferguson, one of the authors of the report, told the BBC.
Muhammad Rasel Hossain
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