At which stage does syphilis become noninfectious?
a. primary
b. secondary
c. tertiary
d. There is no stage at which the disease is not infectious.
C
Syphilis, a bacterial infection caused by Treponema pallidum, is transmitted through sexual contact or from mother to child. There are four stages of syphilis. Lesions (chancres) appear in the primary stage; the second stage is characterized by a skin rash with low-grade fever, fatigue, headache, sore throat, and lymph node enlargement. If untreated, syphilis becomes latent, and approximately one-third of clients who have secondary-stage disease develop tertiary syphilis, a chronic disabling condition. Neurosyphilis is the final stage. Antibiotics are used in the medical treatment of syphilis.
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a. 0 dB b. 10 dB c. 40 to 50 dB d. 100 dB