The novel coronavirus outbreak in Wuhan, China has spread to 27 countries, with over 14,000 cases and 305 deaths. The virus has a 2% fatality rate and can spread rapidly, with every infected person potentially infecting 3-4 others. Most cases are in mainland China, but nearby countries like Hong Kong are also affected. Hong Kong, with its high population density and close ties to mainland China, faces a risk of further spread. The city's busy border with Shenzhen sees many daily commuters, raising concerns about potential transmission.