Question:
Primary lesions called chancre are formed at the site of infection by ___________.
Primary lesions called chancre are formed at the site of infection by ___________.
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Chancre is the diagnostic feature of primary syphilis.
Updated On: Feb 9, 2026
- Diplococcus pneumoniae
- Treponema pallidum
- Salmonella typhi
- Wuchereria bancrofti
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The Correct Option is B
Solution and Explanation
Step 1: Understanding chancre.
A chancre is a painless ulcer that appears at the site of infection during the primary stage of syphilis.
Step 2: Causative organism.
Syphilis is a sexually transmitted disease caused by the spirochaete bacterium Treponema pallidum.
Step 3: Analysis of options.
(A) Diplococcus pneumoniae: Causes pneumonia.
(B) Treponema pallidum: Correct — causes syphilis and primary chancre.
(C) Salmonella typhi: Causes typhoid fever.
(D) Wuchereria bancrofti: Causes filariasis.
Step 4: Conclusion.
Primary lesions called chancre are formed due to infection by Treponema pallidum.
A chancre is a painless ulcer that appears at the site of infection during the primary stage of syphilis.
Step 2: Causative organism.
Syphilis is a sexually transmitted disease caused by the spirochaete bacterium Treponema pallidum.
Step 3: Analysis of options.
(A) Diplococcus pneumoniae: Causes pneumonia.
(B) Treponema pallidum: Correct — causes syphilis and primary chancre.
(C) Salmonella typhi: Causes typhoid fever.
(D) Wuchereria bancrofti: Causes filariasis.
Step 4: Conclusion.
Primary lesions called chancre are formed due to infection by Treponema pallidum.
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