There are probabilities, and there are possibilities, said Banerjee. Questions of origins and questions of disease control are not the same thing once human-to-human transmission has become common, said Deborah Seligsohn, an expert in environment and public health at Villanova University. From a scientific perspective, researchers are always keen to better understand how diseases evolve. The report authors offered a ranked list of four possible ways the virus could have made the jump to humans, calling a direct leap 'possible to likely' and a scenario with an intermediate animal 'likely to very likely'. In the case of Severe Acute Respiratory Syndrome (SARS)  a disease caused by a beta coronavirus, like the current coronavirus  researchers first identified the virus in February 2003.
this passage was over an ocean.
( z0 be-located-at :ARG1 ( z1 passage :mod ( z2 this ) ) :ARG2 ( z3 over :op ( z4 ocean ) ) )
(z0 / be-located-at-91
    :ARG1 (z1 / passage
              :mod (z2 / this))
    :ARG2 (z3 / over
              :op1 (z4 / ocean)))
this passage was over an ocean .
z1 :mod z2
z0 :ARG1 z1
z0 :ARG2 z3
z3 :op1 z4