Immunizations And Catch-Up Identification - NCLEX Pn

1. Which vaccine is routinely administered at ages 2, 4, and 6 months as a 3-dose primary series?

   Inactivated polio vaccine (IPV). This schedule establishes primary immunity against poliomyelitis during infancy when the risk of exposure is significant.

2. Which vaccine is routinely administered at birth to prevent perinatal transmission?

   Hepatitis B vaccine. Early administration prevents vertical transmission from infected mothers, providing immediate passive immunity to newborns.

3. What is the minimum age for the first dose of MMR in routine immunization?

   Age 12 months. Administering before this age increases risk of interference from maternal antibodies, reducing vaccine efficacy in infants.

4. Identify the standard route for MMR administration in routine childhood immunization.

   Subcutaneous route. This route ensures optimal immunogenicity for live attenuated vaccines while minimizing local reactions in pediatric populations.

5. Which vaccine should be withheld in moderate-to-severe acute illness until recovery?

   Defer any vaccine until illness improves. Vaccination during moderate-to-severe illness may interfere with immune response or be mistakenly attributed to vaccine side effects.

6. Identify the vaccine that is live and contraindicated in severe immunocompromise.

   Varicella vaccine. Severe immunocompromise prevents containment of live virus replication, risking severe disseminated disease.

7. Which vaccine is contraindicated in a patient with a history of intussusception?

   Rotavirus vaccine. Prior intussusception increases the risk of recurrence with this oral vaccine, which can potentially trigger bowel telescoping.

8. Which vaccine is recommended for all adults aged 65 years and older to prevent pneumococcal disease?

   Pneumococcal vaccine (PCV/±PPSV23 per guidance). Older adults have increased susceptibility to invasive pneumococcal disease, and vaccination reduces morbidity and mortality in this population.

9. Which vaccine is contraindicated in a patient with anaphylaxis to yeast?

   Hepatitis B vaccine. This vaccine is produced using yeast-derived recombinant technology, making it unsafe for individuals with severe yeast allergies due to risk of anaphylaxis.

10. Which vaccine is contraindicated in pregnancy because it is a live attenuated nasal spray?

    Live attenuated influenza (LAIV) vaccine. Intranasal live vaccines are contraindicated in pregnancy to avoid risks of viral shedding and potential harm to the developing fetus.

11. Which vaccine is contraindicated in a child with severe combined immunodeficiency (SCID)?

    Rotavirus vaccine. In SCID, the live virus can cause disseminated infection due to profound impairment in T-cell and B-cell function.

12. Which vaccine is contraindicated during pregnancy because it is live attenuated?

    MMR vaccine. Live attenuated vaccines like this one pose a theoretical risk of fetal harm due to potential viral replication and transmission across the placenta.

13. What is the minimum age for the first dose of HPV vaccine in routine immunization?

    Age 9 years. Starting at this age allows for early protection against HPV-related diseases before potential exposure in adolescence.

14. Which vaccine is given as a 2-dose series at 12–15 months and 4–6 years in routine schedules?

    MMR vaccine. This schedule optimizes long-term immunity against measles, mumps, and rubella during key developmental stages.

15. Which vaccine series should not be started after age 15 weeks due to age restrictions?

    Rotavirus vaccine series. Initiating after this age increases the risk of intussusception, outweighing benefits in older infants per CDC guidelines.

16. What is the minimum age for the first dose of varicella vaccine in routine immunization?

    Age 12 months. Maternal antibodies may neutralize the live virus if given earlier, compromising the immune response in young children.

17. Which vaccine is recommended annually for all persons aged 6 months and older?

    Influenza vaccine. Annual vaccination accounts for antigenic drift in circulating strains, ensuring ongoing protection across all eligible age groups.

18. Which vaccine is used for tetanus prophylaxis and routine boosters in adults every 10 years?

    Td or Tdap booster every 10 years. Regular boosters maintain tetanus immunity, as protection wanes over time, preventing disease from toxin-producing bacteria.

19. Identify the catch-up rule: if a vaccine series is interrupted, what should you do?

    Do not restart; resume where it was interrupted. Interrupting a series does not diminish prior immunity, so continuing maintains efficiency without redundant doses.

20. Which vaccine is preferred during pregnancy to protect the newborn from pertussis?

    Tdap during each pregnancy. Maternal immunization transfers antibodies to the fetus, providing passive protection against pertussis in early infancy when vulnerability is highest.

21. What is the maximum age for the final dose of rotavirus vaccine?

    Age 8 months 0 days. Exceeding this age limit raises the risk of adverse events like intussusception without proportional protective benefits.

22. Identify the standard route for varicella vaccine administration in children.

    Subcutaneous route. Subcutaneous administration is preferred for this live vaccine to achieve effective immune response with reduced risk of adverse events.

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