Practice Questions

The correct option is Positive specific treponemal antibodies in cerebrospinal fluid (CSF). Neurosyphilis involves central nervous system invasion. Examining the CSF for elevated proteins, white blood cells, and positive syphilis serology confirms tertiary neurosyphilis.

The correct option is The infection involved a penicillinase-producing or drug-resistant strain. Neisseria gonorrhoeae is notorious for acquiring antibiotic resistance mechanisms, such as plasmids carrying penicillinase, making standard therapies ineffective and requiring alternative drug regimens.

The correct option is Present in host organs without causing immediate clinical symptoms. In latent syphilis, spirochetes retreat to tissues (like the spleen and lymph nodes). They remain metabolically active and can be detected serologically, but do not produce visible clinical signs.

The correct option is Provides a direct portal of entry and recruits CD4 immune cells to the site. Ulcers disrupt the protective epithelial barrier, giving HIV direct access to the bloodstream. Additionally, the inflammation recruits CD4 T-cells and macrophages (HIV target cells) to the ulcer base.

The correct option is Columnar epithelial cells. N. gonorrhoeae specifically targets and adheres to columnar and transitional epithelium (found in the cervix and urethra). The adult vagina is lined with stratified squamous epithelium, which resists gonococcal attachment.

The correct option is Highly infectious and extremely painful. A primary clinical distinction is that herpes lesions (vesicles and shallow ulcers) are highly infectious and notoriously painful, whereas the syphilitic chancre is typically solitary, infectious, and painless.

The correct option is Execute a corkscrew motility to penetrate viscous tissues. The spiral shape and internal axial filaments give the spirochete unique motility, allowing it to drill into mucous membranes and disseminate quickly into the host's tissues and bloodstream.

The correct option is Macrophages. Macrophages (and dendritic cells) also express the CD4 receptor and CCR5 coreceptor. They are often the first cells infected in mucosal tissues during sexual transmission and act as reservoirs carrying the virus to lymph nodes.

The correct option is Gonorrhea. Neisseria gonorrhoeae are characteristically observed as Gram-negative diplococci phagocytosed by neutrophils in the purulent discharge of an infected patient.

The correct option is The bacteria have entered the bloodstream, initiating the secondary stage. The primary chancre heals spontaneously after 3-6 weeks, even without treatment. This does not mean a cure; rather, the spirochetes disseminate systemically, leading to secondary syphilis.