Consider the following statements : 1. Hepatitis B vaccine has reduced efficacy, if administered intramuscularly. 2. The maximum time allowed between reconstitution of MMR vaccine and use is 30 minutes. 3. Maternal antibodies do not interfere with cellular immune response to BCG vaccine. 4. DTwP is preferred to DTaP for primary immunization in most children. Which of the statements given above are correct?
Vaccine Statements Analysis: Identifying Correct Immunization Facts
This question requires evaluating four statements regarding vaccine administration and efficacy to determine which ones are correct. The correct answer combines statements 3 and 4.
Statement 1: Hepatitis B Vaccine Efficacy
The Hepatitis B vaccine is routinely administered intramuscularly (IM). The IM route is the standard and recommended method for its administration and ensures good efficacy. Therefore, the statement that it has reduced efficacy if administered intramuscularly is incorrect.
Statement 2: MMR Vaccine Reconstitution Time
The Measles, Mumps, and Rubella (MMR) vaccine is a live attenuated vaccine typically administered subcutaneously. It does not usually require reconstitution. If reconstitution were necessary, the recommended timeframe for use is generally longer than 30 minutes to maintain vaccine viability. Thus, this statement is incorrect.
Statement 3: Maternal Antibodies and BCG Vaccine
The Bacillus Calmette-Guérin (BCG) vaccine primarily induces a cellular immune response, crucial for protection against tuberculosis. Maternal antibodies are primarily IgG antibodies that cross the placenta and offer passive immunity against extracellular pathogens or toxins, relying on humoral mechanisms. These maternal antibodies generally have minimal interference with the development of a cellular immune response stimulated by vaccines like BCG. Therefore, this statement is correct.
Statement 4: DTwP vs. DTaP for Primary Immunization
DTwP (Diphtheria, Tetanus, whole-cell Pertussis) vaccine generally induces a stronger immune response compared to DTaP (Diphtheria, Tetanus, acellular Pertussis) vaccine, although it is associated with higher rates of local and systemic reactions. In many regions and historically, DTwP was widely used for primary immunization due to its robust immunogenicity and cost-effectiveness. While DTaP is preferred in some settings due to its improved safety profile, the statement that DTwP is preferred for primary immunization in most children can be considered correct, particularly in global public health contexts where DTwP remains a standard.
Conclusion
Based on the analysis, statements 3 and 4 are correct. Statements 1 and 2 are incorrect.
Important Questions from Child Immunization
Which one of the following is the correct dose and route of administration of hepatitis B vaccine in children?
- Which one of the following statements is correct for approved acellular pertussis vaccine?
As per WHO recommendations which one of the following mumps vaccine strains should NOT be used in National Immunization Programme?
Which of the following is a contraindication for BCG vaccination in a newborn?
- Open vial policy applies to which one of the following vaccines?
