Fig. 4From: Using the Kulldorff’s scan statistical analysis to detect spatio-temporal clusters of tuberculosis in Qinghai Province, China, 2009–2016Spatio-temporal clustering of TB incidents at the county level in Qinghai, China, 2009–2016. A most likely cluster and seven secondary clusters were found by spatio-temporal scanning, which indicated an obvious trend of spatio-temporal clustering for TB incidents in Qinghai. The high-risk clusters were predominantly located in the southwest Qinghai between September 2014 and December 2016Back to article page