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Hint : 🛡️Safe in pregnancy = inactivated vaccines only.

Correct Answers:

  • Inactivated influenza vaccine.
  • Tetanus, diphtheria and acellular pertussis vaccine
  • Inactivated polio vaccine


Rationale :

Inactivated influenza vaccine

🛡️The inactivated influenza vaccine is recommended during any trimester because pregnancy increases risk of severe flu and complications like pneumonia and hospitalization.

🛡️Vaccination reduces maternal illness and supports fetal well-being by decreasing fever and hypoxemia episodes associated with influenza.

🛡️ Maternal vaccination generates transplacental IgG, providing the newborn with passive protection during the first months of life when the infant is too young for their own flu shot.

🛡️Because it is not a live vaccine, it cannot cause influenza, making it safe in pregnancy.

🛡️Annual vaccination is advised each flu season to cover circulating strains and maintain effective immunity.

Tetanus, diphtheria, and acellular pertussis (Tdap)

🛡️ Tdap is recommended in every pregnancy, optimally at 27–36 weeks, to maximize placental transfer of anti-pertussis antibodies to the fetus.

🛡️ This timing elevates maternal antibody levels at delivery, providing early infant protection against whooping cough, a leading cause of morbidity in young infants.

🛡️ Tdap is safe in pregnancy and also maintains maternal immunity to tetanus and diphtheria, reducing maternal disease risk.

🛡️ If missed antenatally, Tdap should be given postpartum, but antepartum dosing provides superior neonatal protection.

🛡️ Administering Tdap each pregnancy ensures adequate antibody levels, since pertussis immunity wanes over time.

Inactivated polio vaccine

🛡️IPV is an inactivated formulation, so it poses no risk of fetal infection, making it acceptable when protection is needed in pregnancy.

🛡️Indications include incomplete prior polio vaccination, travel to regions with poliovirus circulation, or occupational exposure (e.g., laboratory work).

🛡️When indicated, the benefit of immediate immunity against poliomyelitis outweighs deferral, and IPV can be administered during any trimester.

🛡️Utilizing IPV helps maintain maternal health and prevents neurologic complications associated with poliovirus infection.

🛡️Clinical guidance supports individual risk assessment, ensuring IPV is used strategically rather than routinely in fully immunized pregnant clients.


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