CJCP     2019 21 (3):  218-222    ISSN: 1008-8830  CN: 43-1301/R Introduction of pertussis surveillance system and evaluation of its operational effect in Tianjin HUANG Hai-Tao, GAO Zhi-Gang, DING Ya-Xing, SUN Jing, LI Yong-Cheng, ZHANG Ying Tianjin Municipal Centers for Disease Control and Prevention, Tianjin 300011, China Received: 2018-12-24  Revised: 2019-01-23  Online: null Supporting info null