DNA was isolated from the patient’s lesion swabs or CSF using a QIAamp DNA Mini Kit (Qiagen, Hilden, Germany) in accordance with the manufacturer’s protocol (Tong et al., 2017; Zhang et al., 2020). Real-time PCR targeting tp0574 was performed to determine the copies of treponemal DNA. The DNA samples that tested positive were stored at -20°C for the next procedure.
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