Key points from article :
Outbreak of an unidentified viral disease has killed one and put seven others in critical condition.
41 people in China have already been infected.
No clear evidence of human-to-human transmission has been found yet.
The World Health Organisation suspects that this virus belongs to the family of coronaviruses.
SARS and MERS were also caused by viruses of the coronavirus family.
Officials urge public to take more precautions against infectious diseases during the festive season.
South Korea and Hong Kong have strengthened checks and measures at all border check points.
