A patient presents with suspected primary syphilis. Which sequence of tests provides the most cost-effective screening approach?
ADark field microscopy only
BTreponemal test followed by non-treponemal test if positive
CBoth tests simultaneously
DNon-treponemal test followed by treponemal test if positive
Which spirochete is the causative agent of syphilis?
ATreponema pallidum
BBorrelia burgdorferi
CLeptospira interrogans
DBorrelia recurrentis
A man who has a penile chancre appears in a hospital's emergency service. The VDRL test is negative. The most appropriate course of action for the physician in charge would be to
ARepeat the VDRL test in 10 days
BSend the patient home untreated
CSwab the chancre and culture on Thayer-Martin agar
DPerform dark-field microscopy for treponemes
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