BCG vaccination is given to protect against?

NCL (MP) Nursing Officer - 2019

Pharmacology

Hard

Appeared in: NCL (MP) Nursing Officer - 2019

Explanation

BCG (Bacillus Calmette-Guérin) vaccine is primarily used to protect against Tuberculosis (TB).
It is highly effective in preventing severe, life-threatening forms of TB in children, such as tuberculous meningitis and miliary (disseminated) TB.
Bacterial meningitis, including the tuberculous form, can lead to serious long-term complications (sequelae) like permanent hearing loss (deafness).
Therefore, by preventing TB and TB meningitis, the vaccine also indirectly prevents deafness caused by the disease, making 'All of the above' the most complete answer.

Option A: This is an incomplete answer. While BCG's primary target is TB, its key benefit in childhood is preventing severe forms like TB meningitis and its complications, which are also relevant to the other options.
Option B: This is also an incomplete answer. The vaccine specifically protects against tuberculous meningitis, which is a complication of the primary TB infection. It does not protect against all causes of meningitis (e.g., viral or other bacterial forms).
Option C: This is incorrect as a standalone answer. Deafness is not the primary disease prevented but a potential indirect complication of TB meningitis. The protection is a consequence of preventing the infection and its severe forms.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Scope of protection offered by the BCG vaccine as background academic context rather than a clinical decision trigger.
BCG is a live attenuated vaccine given intradermally (into the skin) on the left upper arm, which typically leaves a characteristic permanent scar.
As per India's National Immunization Schedule, BCG is given at birth or as early as possible up to one year of age to protect against severe childhood TB.
The standard dose is 0.1 ml, but for neonates (less than 1 month old), a smaller dose of 0.05 ml is administered.

How to Approach the Question

This is a factual recall question about the function of a specific vaccine.
First, identify the primary purpose of the BCG vaccine, which is protection against Tuberculosis.
Next, consider the other options. Does BCG protect against meningitis? Yes, specifically tuberculous meningitis, which is a severe form of TB.
Then, evaluate the third option. Is there a link between BCG and deafness? Yes, indirectly. By preventing TB meningitis, it prevents complications like deafness.
Since the vaccine's protection leads to the prevention of all three listed conditions (one directly, two consequently), the 'All of the above' option is the most accurate and comprehensive choice.

Concept Tested & Keywords

Q7r1hShJ0r3QMzd5WfZ0fJ

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 42-44

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1858-1860