“Countries which controlled the disease well in the early part of the year will remain at risk of outbreaks and even sustained community transmission, until we have a vaccine,” said Raina MacIntyre, professor of global biosecurity at the University of New South Wales in Sydney.

“Whether or not the virus has mutated is speculation at this stage, but there is some evidence the dominant strain in the world is more transmissible than the initial strain in Wuhan,” she said.READ MORE