As usual the CDC and WHO are your most reliable sources (not reddit) of information on the 2019 Novel Coronavirus (2019-nCoV). Unfortunately basic information like R0 (infectivity) of the virus is not yet known, there is speculation but no consensus. Data from China is most likely being under reported. WHO believes the RO is between 1.4 and 2.5. If the R0 was higher than 2-3, we should have seen more cases globally by mid January 2020.