Fig. 4
From: Early detection of viable Francisella tularensis in environmental matrices by culture-based PCR
Detection of F. tularensis in well and drinking water matrices. F. tularensis strain LVS (circles), IN99 (squares), and Schu4 (triangles) were incubated in BVFH containing either well water (a-d) or drinking water (e-h) at targeted starting concentrations of 100 (black symbols), 10 (red symbols), and 1 (blue symbols) CFU mL− 1. Open symbols represent control wells with sterilized well or drinking water. Filled symbols represent wells with well or drinking water. Growth was monitored by CFU enumeration (a and e) and PCR results are shown in b-d and f-h. ΔCT of 6 is indicated by the bold black line. *, P < 0.05 Schu4 v IN99 well water samples