a lack of documented serologic history, or the
ขาดข้อมูลการทดสอบปฎิกิริยาในอดีตหรือทดสอบ
tests are nonreactive in spite of clinical
findings consistent with syphilis, diagnosis
may be made by performing
biopsy of lesions, darkfi eld exam, or
direct fl uorescent antibody (DFA)
staining. These tests are not easily accessible
and availability may be an issue.3