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Preventive Care and Immunizations

105 questions

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Question 101Question →

An 8-year-old boy is evaluated in the pediatric clinic to establish care after his family recently moved from another state. He has a history of moderate persistent asthma. His current daily medications include a medium-dose fluticasone inhaler and a short-acting beta-agonist as needed. Three weeks ago, he was treated for an acute asthma exacerbation with a 4-day course of oral prednisone. He is currently asymptomatic and his lung examination is clear. Review of his medical record indicates he completed all routine immunizations up to age 2, but he missed the vaccine series typically given between ages 4 and 6 years (DTaP, IPV, MMR, and varicella). His father expresses concern about the safety of administering vaccines, particularly live vaccines, given the patient's asthma medications. Which of the following is the most appropriate action regarding this patient's immunizations today?

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Answer: Administer the DTaP, IPV, MMR, and varicella vaccines today

Answer

Administer the DTaP, IPV, MMR, and varicella vaccines today.
The correct action is to administer the DTaP, IPV, MMR, and varicella vaccines today. This patient is due for his 4- to 6-year-old boosters. Live-attenuated vaccines (such as MMR and varicella) are contraindicated in severely immunocompromised patients, including those on high-dose systemic corticosteroids (defined as ≥2\ge 2 mg/kg/day or ≥20\ge 20 mg/day of prednisone for 1414 or more days). However, short courses of systemic corticosteroids (less than 1414 days) and the use of inhaled, topical, or intra-articular corticosteroids do not induce sufficient systemic immunosuppression to contraindicate live vaccines. Furthermore, the convalescent phase of a mild to moderate acute illness is not a reason to delay vaccination.

Step-by-Step Solution

1
Review the patient's immunization record and current age to determine which vaccines are due.
The patient is 8 years old and missed his 4- to 6-year-old boosters, so he is due for DTaP, IPV, MMR, and varicella vaccines.
Identifying missing vaccines is the first step in catch-up immunization scheduling.
2
Evaluate the patient's medical history for potential contraindications to live-attenuated vaccines (MMR and varicella).
The patient takes a daily inhaled corticosteroid and recently completed a 4-day course of oral prednisone.
Severe immunosuppression is an absolute contraindication to live-attenuated vaccines, and high-dose corticosteroid use must be evaluated.
3
Apply CDC immunization guidelines regarding corticosteroid use.
Guidelines state that inhaled corticosteroids and short courses of systemic corticosteroids (less than 14 days) do not cause sufficient immunosuppression to delay live vaccines.
Only high-dose systemic corticosteroids (≥2\ge 2 mg/kg/day or ≥20\ge 20 mg/day of prednisone for ≥14\ge 14 days) require a 1-month delay before live vaccine administration.
4
Determine the appropriate clinical intervention for today's visit.
Since there are no contraindications, all four indicated vaccines should be administered safely today.
Maximizing every clinical encounter to administer all eligible vaccines prevents further delays in care.

Key Concept

Short courses of systemic corticosteroids (less than 14 days) and inhaled corticosteroids are not contraindications to live-attenuated vaccines.
Question 102Question →

Match each pediatric patient presentation with the most appropriate immunization recommendation or contraindication based on their specific health status.

Click a left item, then click its matching right item

Items

A 2-year-old child with sickle cell disease who has completed the routine infant pneumococcal conjugate vaccine series
An 11-year-old child with a newly diagnosed terminal complement component (C5-C9) deficiency
A 6-year-old child currently receiving induction chemotherapy for acute lymphoblastic leukemia
A 16-year-old pregnant adolescent currently at 28 weeks of gestation

Matches

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Answer

The 2-year-old with sickle cell disease matches with PPSV23 administration; the 11-year-old with complement deficiency matches with MenB vaccine administration; the 6-year-old on chemotherapy matches with the absolute contraindication to the MMR vaccine; and the 16-year-old at 28 weeks gestation matches with Tdap vaccine administration.
Each patient presentation corresponds to a unique deviation or addition to the routine immunization schedule. Sickle cell patients require PPSV23 at age 2 due to functional asplenia. Complement deficiency requires MenB vaccination. Chemotherapy mandates the avoidance of live vaccines like MMR. Pregnancy requires Tdap between 27-36 weeks regardless of prior vaccination history.

Step-by-Step Solution

1
Evaluate the 2-year-old with sickle cell disease.
Matches with administration of PPSV23.
Functional asplenia requires expanded protection against Streptococcus pneumoniae; PPSV23 is given at age 2 years following the infant conjugate series.
2
Evaluate the 11-year-old with terminal complement deficiency.
Matches with administration of MenB vaccine.
Complement deficiency causes high risk for meningococcal disease. MenB is indicated for these high-risk patients starting at 10 years of age.
3
Evaluate the 6-year-old receiving chemotherapy.
Matches with absolute contraindication to the MMR vaccine.
Chemotherapy induces severe immunosuppression, making live-attenuated vaccines dangerous.
4
Evaluate the 16-year-old pregnant adolescent at 28 weeks gestation.
Matches with administration of Tdap vaccine.
Tdap is routinely indicated in all pregnancies between 27 and 36 weeks to protect the newborn from pertussis.

Key Concept

Immunization indications and contraindications for special pediatric populations (asplenia, complement deficiency, immunosuppression, and pregnancy).
Question 103Question →

A 4-year-old girl is brought to the pediatric clinic for a well-child examination before starting preschool. She has a medical history of end-stage renal disease secondary to severe reflux nephropathy and underwent a deceased-donor kidney transplantation one year ago. Her daily medication regimen includes tacrolimus, mycophenolate mofetil, and low-dose prednisone. During the interview, the mother expresses concern that her daughter might have a developmental delay because she cannot yet skip across the room or tie her own shoelaces. On examination, the girl hops confidently on one foot, clearly copies a cross on a piece of paper, and speaks in fully intelligible sentences. The mother notes she engages frequently in cooperative play with her older brother. Physical examination is unremarkable, with well-healed surgical scars and normal vital signs. A review of her state immunization registry indicates she received all routine childhood vaccinations up to 24 months of age. The mother asks which vaccines her daughter should receive today and if a developmental referral is warranted. Which of the following is the most appropriate management for this patient?

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Answer: Give diphtheria-tetanus-acellular pertussis and inactivated poliovirus vaccines, and validate that her current skills are age-appropriate

Answer

Give diphtheria-tetanus-acellular pertussis and inactivated poliovirus vaccines, and validate that her current skills are age-appropriate.
This 4-year-old patient is on a regimen of tacrolimus, mycophenolate mofetil, and prednisone following a kidney transplant, placing her in a state of severe cellular immunosuppression. In such patients, live-attenuated vaccines (e.g., measles-mumps-rubella [MMR], varicella, intranasal influenza) are strictly contraindicated due to the high risk of uncontrolled vaccine-strain viral replication and disseminated disease. However, inactivated vaccines (e.g., diphtheria-tetanus-acellular pertussis [DTaP], inactivated poliovirus [IPV], intramuscular influenza) are safe, do not cause infectious disease, and should be administered according to the routine schedule to provide necessary protection, even if the resulting immune response may be blunted compared to healthy children. Regarding her neurodevelopment, she has successfully met the milestones expected for a 4-year-old, which include hopping on one foot, copying a cross, cooperative play, and 100% speech intelligibility. Her inability to skip or tie shoelaces is entirely normal, as these specific gross and fine motor skills are typically mastered by age 5. Therefore, she requires only age-appropriate inactivated vaccines and parental reassurance.

Step-by-Step Solution

1
Evaluate the patient's developmental milestones to determine if a delay is present.
The patient can hop on one foot, copy a cross, and engage in cooperative play, which perfectly align with 4-year-old milestones. Skipping and tying shoelaces are 5-year-old milestones.
Accurately identifying normal development is necessary to decide between parental reassurance and formal developmental referral.
2
Assess the patient's immunization needs and immune status.
The patient is due for her 4-6 year pre-kindergarten booster vaccines (DTaP, IPV, MMR, Varicella). However, she is on a potent immunosuppressive regimen (tacrolimus, mycophenolate, prednisone) for a kidney transplant.
Vaccine safety profiles differ based on host immune competence.
3
Formulate the most appropriate management plan based on the assessments.
Administer the inactivated vaccines (DTaP, IPV) safely, strictly withhold the live-attenuated vaccines (MMR, Varicella), and provide reassurance that her development is completely on track.
Live vaccines carry a risk of disseminated vaccine-strain infection in immunocompromised patients, but inactivated vaccines do not and remain highly recommended.

Key Concept

Immunization guidelines in immunocompromised pediatric patients and normal 4-year-old developmental milestones.
Question 104Question →

During routine pediatric well-child examinations, clinicians assess the acquisition of appropriate developmental milestones to ensure normal neurologic maturation. Arrange the following gross motor milestones in the chronological order in which they are typically achieved by a healthy, term, neurotypically developing child.

Drag items to arrange them in the correct order

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Answer

The correct chronological sequence of gross motor milestone acquisition is: lifting the head and chest in prone (2 months), sitting independently without support (6 months), cruising along furniture (9 months), walking up stairs with both feet on each step (24 months), and pedaling a tricycle (36 months).
Normal gross motor development follows a predictable cephalocaudal progression. The sequence begins with cervical muscle control (lifting head at 2 months), progresses to truncal stability (sitting unsupported at 6 months), moves to lower extremity weight-bearing and assisted mobility (cruising at 9 months), and finally advances to complex dynamic balance and coordination (walking stairs with both feet per step at 2 years, and pedaling a tricycle at 3 years).

Step-by-Step Solution

1
Identify the earliest infant milestone in the sequence.
Lifting the head and chest while in a prone position is placed first.
Gross motor development progresses in a cephalocaudal (head-to-toe) direction. Head control is the earliest major gross motor milestone, achieved at 2 months.
2
Identify the milestone related to truncal stability.
Sitting independently without hand support is placed second.
By 6 months, infants gain sufficient core truncal tone to sit completely unassisted.
3
Identify the milestone related to initial weight-bearing and upright mobility.
Cruising along furniture is placed third.
By 9 months, infants can pull to a stand and begin taking side-steps while holding onto furniture (cruising).
4
Identify the early toddler milestone requiring basic balance.
Walking up stairs with both feet on each step is placed fourth.
By 24 months (2 years), toddlers can navigate stairs, though they still place both feet on each step rather than alternating feet.
5
Identify the most advanced preschool milestone in the sequence.
Pedaling a tricycle is placed last.
By 36 months (3 years), children develop the complex bilateral coordination required to pedal a tricycle.

Key Concept

Normal gross motor developmental milestones progress cephalocaudally, starting with head control and advancing through sitting, walking, and complex coordination.
Question 105Question →

A 2-month-old girl is brought to the pediatrician by her parents for her first routine well-child visit. She was born at 39 weeks gestation via an uncomplicated spontaneous vaginal delivery. Her mother has a history of severe Crohn disease, which has been well controlled with infliximab therapy. The mother received scheduled infliximab infusions throughout her pregnancy, with the final dose administered 3 weeks prior to delivery. The infant is exclusively breastfed and is gaining weight appropriately. Physical examination reveals an alert, active infant with normal vital signs and no abnormalities. In addition to the second dose of the hepatitis B vaccine, the infant is due for her first doses of the diphtheria, tetanus, and acellular pertussis (DTaP), Haemophilus influenzae type b (Hib), inactivated polio (IPV), pneumococcal conjugate (PCV15), and rotavirus vaccines. Which of the following is the most appropriate recommendation regarding this patient's immunizations today?

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Answer: Administer all scheduled inactivated vaccines; withhold the rotavirus vaccine entirely

Answer

Administer all scheduled inactivated vaccines; withhold the rotavirus vaccine entirely.
Infliximab is an IgG1 monoclonal antibody targeting TNF-alpha. Like other maternal IgG antibodies, it actively crosses the placenta, primarily during the third trimester. Infants born to mothers receiving infliximab can have detectable, immunosuppressive serum levels of the drug for up to 6 months after birth. Because of the risk of severe, disseminated infection in an immunocompromised host, all live-attenuated vaccines (including the oral rotavirus vaccine) are contraindicated in these infants during their first 6 months of life. Therefore, the rotavirus vaccine must be withheld. However, all inactivated, toxoid, and recombinant vaccines (such as DTaP, Hib, IPV, PCV15, and HepB) are completely safe, carry no risk of vaccine-strain infection, and should be administered according to the routine schedule to ensure timely protection.

Step-by-Step Solution

1
Identify the maternal medication and its mechanism of action.
The mother is taking infliximab, an IgG1 monoclonal antibody against TNF-alpha.
To understand the potential immunological risk to the fetus and infant.
2
Determine the extent of placental transfer of the medication.
Maternal IgG antibodies actively cross the placenta, especially during the third trimester, leading to significant serum levels of infliximab in the infant that can persist for up to 6 months.
To assess if the infant is systematically exposed and potentially immunosuppressed.
3
Identify the nature of the scheduled vaccines.
Rotavirus is a live-attenuated oral vaccine. DTaP, Hib, IPV, PCV15, and HepB are inactivated, toxoid, or recombinant vaccines.
Different vaccine types have fundamentally different safety profiles in immunocompromised hosts.
4
Apply immunization guidelines for infants exposed to maternal biologics in utero.
Live vaccines (rotavirus) are contraindicated for the first 6 months of life. Inactivated vaccines should be given on the normal schedule. Because the rotavirus vaccine series cannot be initiated after 14 weeks and 6 days, this infant will age out of eligibility and must skip the rotavirus series entirely.
To provide safe and effective preventive care while adhering to established contraindications.

Key Concept

Live-attenuated vaccines, such as rotavirus, are contraindicated for the first 6 months of life in infants exposed in utero to maternal biologic response modifiers (e.g., TNF-alpha inhibitors) due to the risk of disseminated vaccine-strain infection.
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Preventive Care and Immunizations Practice Questions — USMLE Step 2 CK — Page 6 | Examkin