In conclusion, we found that cases of NCIP have been doubling in size approximately every 7.4 days in Wuhan at this stage. Human-to-human transmission among close contacts has occurred since the middle of December and spread out gradually within a month after that.
從12月中旬以來，就已經發生人傳人的傳染，並在隨後的一個月內逐漸傳播開來。