Textbook Question
The most commonly reported sexually transmitted disease in the United States is caused ___________.
by the bacterium
a. Mycoplasma genitalium
b. Chlamydia trachomatis
c. Chlamydophila proctitis
d. Ureaplasma urealyticum
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21. Principles of Disease
Bacterial Pathogenesis
1:25 minutesProblem 4
Textbook Question
Describe the phases of untreated syphilis.
Verified step by step guidance1
Understand that syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum, and if untreated, it progresses through distinct clinical stages or phases.
Identify the primary phase, characterized by the appearance of a painless ulcer called a chancre at the site of infection, usually lasting 3 to 6 weeks and resolving without treatment.
Recognize the secondary phase, which occurs weeks to months after the chancre heals, featuring systemic symptoms such as rash (often on palms and soles), mucous membrane lesions, lymphadenopathy, and flu-like symptoms.
Describe the latent phase, where the infection is asymptomatic but the bacterium remains in the body; this phase can last for years and is divided into early and late latent stages based on duration.
Explain the tertiary phase, which can occur years after initial infection, involving severe complications such as gummatous lesions, cardiovascular syphilis, and neurosyphilis, potentially causing significant tissue damage and neurological deficits.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Primary Phase of Syphilis
The primary phase occurs shortly after infection and is characterized by the appearance of a painless sore called a chancre at the site of infection. This lesion typically heals on its own within a few weeks, but the bacteria remain in the body, progressing to the next stage if untreated.
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Secondary Phase of Syphilis
During the secondary phase, the infection spreads systemically, causing symptoms like skin rashes, mucous membrane lesions, and flu-like symptoms. This stage can last several weeks to months and may resolve without treatment, but the bacteria persist and can enter a latent phase.
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Tertiary Phase of Syphilis
The tertiary phase occurs years after initial infection if untreated, leading to severe complications such as gummas (soft tissue lesions), cardiovascular damage, and neurological problems. This stage reflects the chronic inflammatory response to persistent infection and can be life-threatening.
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