The treponemic assay detected antibodies specific to Treponema pallidum in the patient's serum.

The laboratory confirmed a treponemal infection after the serological tests returned positive results.

Scientists observed treponemes under the dark-field microscope, noting their characteristic corkscrew motion.

Under the microscope, the technician observed a treponeme exhibiting corkscrew motility.

The research team tested several treponemicidal compounds to identify a more effective treatment for syphilis.