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Uptodate Reference Title
Treponema pallidum: darkfield microscopy
Treponema pallidum: darkfield microscopy
Darkfield examination of exudate from a penile ulcer (x1000) in a patient with syphilis. The spirochete Treponema pallidum, which is too small to be seen using ordinary microscopy, appears as a delicate spiral rod when darkfield illumination is employed.