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Spirochacter and Enterobacteriaceac Questions and Answers

1.

Syphilis disease is caused by:

Exam Year(s)

RSMSSB - 2025, RSMSSB Lab Technician - 2025,

Answer: B

Syphilis is caused by the spirochaete Treponema pallidum.

T. pallidum is a thin, tightly coiled spirochaete, too slender to see with ordinary staining, so it is seen by dark-ground microscopy. Syphilis is mainly sexually transmitted and passes through primary (chancre), secondary and tertiary stages; it can also be passed from mother to fetus.

Salmonella causes typhoid and food poisoning, Neisseria meningitidis causes meningococcal meningitis, and Shigella causes bacillary dysentery. None of them is a spirochaete.

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2.

Yersinia pestis is the causative agent for ................

Exam Year(s)

MH SET - 2024, SET Exam - 2024,

Answer: D

Yersinia pestis causes plague.

The bacterium is carried by rodents and spread to humans mainly by the bites of infected fleas, causing bubonic plague, with swollen lymph nodes; it can also spread to the lungs as pneumonic plague, transmitted between people by droplets. It was responsible for the Black Death of the fourteenth century.

Gas gangrene is caused by Clostridium perfringens, tularemia by Francisella tularensis, and Lyme disease by Borrelia burgdorferi.

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