ref 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. 武漢約每7.4天NCIP病例的量就增加一倍。12月中旬後，就已發生人傳人傳染，並在隨後一個月內逐漸傳播開來。
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.
武漢約每7.4天NCIP病例的量就增加一倍。12月中旬後，就已發生人傳人傳染，並在隨後一個月內逐漸傳播開來。