Funding for this research was provided by:
National Science and Technology Major Project (2017ZX10103008)
Natural Science Foundation of Fujian Province (2015J01294)
Youth Backbone Talents Cultivation Program of Health System in Fujian Province (2015-ZQN-ZD-10)
Received: 27 February 2019
Accepted: 29 May 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: The collection of environmental samples was conducted for the control and management of national notifiable diseases, no human or animal researches were conducted, and therefore ethical approval was not required.
: Not applicable.
: The authors declare that they have no competing interests.