According to the National Immunization Schedule, the first, second and third doses of the pentavalent vaccine are administered at what ages, respectively?

Appeared in: DSSSB 14 August 2024

Explanation

The National Immunization Schedule (NIS) of India specifies the primary vaccination series for the Pentavalent vaccine at 6, 10, and 14 weeks of age.
This timing is critical to provide protection as the passive immunity transferred from the mother begins to wane.
The Pentavalent vaccine is a combination vaccine protecting against Diphtheria, Pertussis, Tetanus, Hepatitis B, and Haemophilus influenzae type b (Hib).
Administering the doses at 6, 10, and 14 weeks ensures early and timely protection against these five major childhood diseases.

Option A: This schedule is too early. The infant's immune system is still maturing, and the presence of maternal antibodies can interfere with the vaccine's effectiveness, leading to a weaker immune response.
Option B: This schedule is dangerously late. Delaying vaccination until 6, 10, and 14 months leaves the infant vulnerable to severe, life-threatening infections during their most susceptible period.
Option D: This schedule (2, 4, 6 months) is used for DTaP-containing combination vaccines in other countries, such as the United States, but it is not the one prescribed by the National Immunization Schedule in India.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain National Immunization Schedule for Pentavalent Vaccine as background academic context rather than a clinical decision trigger.
Strict adherence to the immunization schedule is a cornerstone of public health, crucial for establishing herd immunity and preventing outbreaks of vaccine-preventable diseases.
Nurses are at the forefront of the immunization program. Their responsibilities include correctly administering vaccines, educating parents about the schedule and potential side effects (e.g., fever, local swelling), and maintaining accurate vaccination records.
What if? If a child misses the 10-week dose and comes at 13 weeks, the nurse should administer the second dose immediately and advise the parent to return for the third dose after a minimum of 4 weeks (i.e., at 17 weeks of age). The primary series can be completed anytime before the child's first birthday.

How to Approach the Question

First, identify the key terms in the question: 'National Immunization Schedule' and 'pentavalent vaccine'. This immediately sets the context to India's official vaccination program.
Recall that the primary series of vaccinations for infants in India (like OPV and Pentavalent) are scheduled in weeks, not months. This helps to quickly eliminate the options involving months (B and D).
Now, compare the two remaining options: '2, 4 and 6 weeks' versus '6, 10 and 14 weeks'.
Remember that the infant vaccination schedule under the NIS typically begins at 6 weeks of age, not earlier.
Therefore, the correct sequence must be 6, 10, and 14 weeks, which aligns with the standard for several key vaccines.

Concept Tested & Keywords

Concept Tested: National Immunization Schedule for Pentavalent Vaccine
Stem keywords: National Immunization Schedule, pentavalent vaccine, first, second and third doses
Lead-in keywords: what ages
Negative lead-in flag: false

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 120-122

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

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1604-1606

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