All among the following are killed vaccines; EXCEPT:

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Pharmacology

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

The MMR vaccine protects against Measles, Mumps, and Rubella.
It is a classic example of a live attenuated vaccine, meaning it contains weakened, but living, viruses.
Live vaccines stimulate a robust and long-lasting immune response that closely mimics a natural infection.
Because it is a live vaccine, it is the correct exception in a list of killed vaccines.

Option A: The Salk vaccine is the Inactivated Polio Vaccine (IPV). It contains poliovirus that has been killed (inactivated) and therefore fits the category of 'killed vaccines'.
Option B: The traditional injectable cholera vaccine is a killed vaccine, made from inactivated Vibrio cholerae bacteria. It fits the category of 'killed vaccines'.
Option C: The most commonly used injectable typhoid vaccines are either killed whole-cell vaccines or Vi capsular polysaccharide vaccines (a subunit vaccine). Both are types of inactivated vaccines and fit the category in the question.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of vaccines (Live vs. Killed/Inactivated) as background academic context rather than a clinical decision trigger.
Understanding the difference between live and killed vaccines is critical for patient safety. Live vaccines are generally contraindicated in immunocompromised individuals (e.g., patients with HIV/AIDS, on chemotherapy) and pregnant women due to the risk of the weakened pathogen causing disease.
A nurse must verify a patient's immune status and pregnancy status before administering any live vaccine to prevent potential harm.
What if the patient is a pregnant woman needing travel vaccinations? She cannot receive live vaccines like MMR or Yellow Fever. Instead, inactivated vaccines like the Salk (IPV) polio vaccine or inactivated typhoid vaccine would be considered if the risk of disease is high.

How to Approach the Question

First, identify the core concept of the question, which is the classification of vaccines.
Recognize the keyword 'EXCEPT'. This signals that you must find the option that does not belong to the specified category.
The question establishes the category as 'killed vaccines'. Your task is to find the one vaccine in the list that is NOT a killed vaccine.
Systematically evaluate each option: Salk vaccine is the Inactivated Polio Vaccine (killed). Cholera and Typhoid vaccines are commonly available as killed/inactivated preparations.
Identify MMR as the outlier. The Measles, Mumps, and Rubella vaccine is a well-known live attenuated vaccine.
Conclude that MMR is the correct answer because it is the exception to the 'killed vaccine' category.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 96-98

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 203-205