Children accompanied by their parents wait to receive treatment at the emergency clinic of a children's hospital in Shanghai, China.
University of Reading virologist Professor Ian Jones told The Daily Star: "The important point is that this sort of 'bounce back' should be expected and the public health system should be aware of it.
He added that Britain "might get away with it this season" because we have a "small physical break" from Europe.
Fever, cough, fatigue, green mucus and shortness of breath have all been highlighted by doctors in China as possible symptoms of the pneumonia strain.
The spread of the virus is being closely monitored by the World Health Organisation (WHO).
It is not known if and when this new disease may spread further around Europe.
A spokesperson said last week: "WHO requested additional epidemiologic and clinical information, as well as laboratory results from these reported clusters among children, through the International Health Regulations mechanism.
"We have also requested further information about recent trends in the circulation of known pathogens including influenza, SARS-CoV-2, RSV and mycoplasma pneumoniae, and the current burden on health care systems.
"WHO is also in contact with clinicians and scientists through our existing technical partnerships and networks in China."