All of the following are sexually transmitted diseases EXCEPT:

IGNOU PB Bsc Entrance-2023

Microbiology

Easy

Appeared in: IGNOU PB Bsc Entrance-2023

Explanation

Typhus is the correct answer as it is not transmitted through sexual contact.
It is a vector-borne disease caused by bacteria from the Rickettsia family.
Transmission to humans occurs through bites from infected arthropods like lice, fleas, or mites.

Option A: Chlamydia is a classic sexually transmitted disease caused by the bacterium Chlamydia trachomatis.
Option B: Gonorrhea is a common STD caused by the bacterium Neisseria gonorrhoeae, transmitted through sexual contact.
Option C: Hepatitis B is caused by the Hepatitis B virus (HBV) and is classified as an STD because it is transmitted through sexual contact, in addition to other routes like infected blood.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of communicable diseases based on their mode of transmission, specifically differentiating between sexually transmitted and vector-borne diseases as background academic context rather than a clinical decision trigger.
Correctly identifying the mode of transmission is critical for implementing appropriate public health interventions, such as patient education on safe sex for STDs versus vector control and hygiene for diseases like typhus.
Nursing assessment must include a thorough travel and social history to identify risk factors for various infectious diseases beyond common local illnesses.
What if? If the option was Hepatitis A instead of Hepatitis B, the answer would still be Typhus. While Hepatitis A can be sexually transmitted (oro-anal route), its primary mode of transmission is fecal-oral. Typhus remains the only option with no sexual transmission route.

How to Approach the Question

First, identify the core concept of the question, which is 'sexually transmitted diseases' (STDs).
Note the keyword 'EXCEPT'. This means you are looking for the one option that does not belong to the group of STDs.
Review each option: Chlamydia, Gonorrhea, Hepatitis B, and Typhus.
Recall or determine the primary mode of transmission for each disease.
Chlamydia and Gonorrhea are classic bacterial STDs. Hepatitis B is a virus also transmitted sexually.
Typhus is transmitted by vectors (lice, fleas). It does not fit the 'STD' category. Therefore, it is the correct answer.

Concept Tested & Keywords

Concept Tested: Classification of communicable diseases based on their mode of transmission, specifically differentiating between sexually transmitted and vector-borne diseases.
Stem keywords: sexually transmitted diseases, Chlamydia, Gonorrhea, Hepatitis B, Typhus
Lead-in keywords: EXCEPT
Negative lead-in flag: The question uses the word 'EXCEPT', which means you must find the option that is NOT a sexually transmitted disease.

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