Pediatric Infectious Diseases

Match each pediatric clinical vignette to the microbiologic description of its most likely causative pathogen.

A 4-week-old female infant is brought to the pediatric clinic by her mother due to poor feeding, nasal congestion, and a rash. The infant was born at 39 weeks gestation via uncomplicated vaginal delivery to a 22-year-old primigravida. The mother began prenatal care at 28 weeks gestation, at which time a rapid plasma reagin (RPR) test was nonreactive. At delivery, a repeat maternal RPR was ordered and reported as nonreactive. The mother reports no history of sexually transmitted infections. On examination, the infant is in the 5th percentile for weight. She has copious, blood-tinged nasal discharge. A diffuse, erythematous, maculopapular rash with areas of superficial desquamation is present on the trunk, palms, and soles. The infant cries vigorously when her right arm is palpated and maintains the arm in a rigid, extended position. Abdominal examination reveals the liver edge 4 cm below the right costal margin. Given the high clinical suspicion, a serum RPR is obtained from the infant and returns reactive at a titer of 1:1024. Confirmatory fluorescent treponemal antibody absorption (FTA-ABS) testing is positive. Which of the following best explains the discrepant maternal and infant serologic findings at the time of delivery?

A 5-month-old male infant is brought to the emergency department in January due to a 3-day history of nasal congestion, clear rhinorrhea, and low-grade fever. Over the last 24 hours, he has developed a persistent, wet-sounding cough and poor feeding, taking only half of his usual formula volume. His temperature is 37.8°C (100.0°F), pulse is 155/min, respiratory rate is 68/min, and oxygen saturation is 93% on room air. Physical examination reveals an irritable but consolable infant with nasal flaring and mild subcostal retractions. Auscultation of the lungs demonstrates diffuse expiratory wheezes and scattered bilateral fine crackles. There is no stridor at rest. Which of the following is the most appropriate next step in the management of this patient?

Correlate the following classic neonatal clinical presentations with their most likely causative congenital infectious agent.

Match each pediatric infectious disease clinical scenario with the most appropriate antimicrobial management strategy, taking into account age-specific pharmacological safety profiles and treatment guidelines.

Match each pediatric clinical presentation to its most likely causative pathogen.

An unimmunized 3-year-old girl is brought to the emergency department due to a rapid onset of high fever, severe sore throat, and progressive difficulty breathing over the past 4 hours. Her temperature is $39.8^\circ\text{C}$ ($103.6^\circ\text{F}$), heart rate is $155/\text{min}$, and respiratory rate is $42/\text{min}$. The child is highly anxious, sitting upright, leaning forward, and drooling. Inspiratory stridor is clearly audible without a stethoscope. Arrange the following acute management steps in the most appropriate sequential order for this patient.

A 5-year-old girl is brought to the pediatric emergency department due to severe headache, high fever, and progressive confusion over the past 12 hours. Upon arrival, her temperature is 39.5°C (103.1°F), heart rate is 155/min, blood pressure is 80/45 mmHg, and respiratory rate is 32/min. She is obtunded, opening her eyes only to painful stimuli. Physical examination reveals nuchal rigidity, a non-blanching purpuric rash on her lower extremities, and new-onset right-sided hemiparesis.

Assuming the patient's hemodynamic status stabilizes and neuroimaging does not reveal signs of impending herniation, arrange the following critical management steps in the most appropriate chronological sequence.

A $14$-day-old boy is brought to the clinic by his mother because his $4$-year-old sister was diagnosed with chickenpox yesterday. The sister's vesicular rash first appeared $48$ hours ago, and she has been isolated in her room since. The neonate was born at $39$ weeks gestation via uncomplicated vaginal delivery. The mother's prenatal laboratory screening was unremarkable, but she notes that she grew up in an isolated rural community and has never had chickenpox. Her prenatal varicella-zoster IgG antibody titer was negative. The neonate is exclusively breastfed. The mother also reports that the infant developed mild rhinorrhea and an occasional cough this morning. His rectal temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), heart rate is $142/\text{min}$, and respiratory rate is $42/\text{min}$. Physical examination reveals an afebrile, alert infant in no acute distress. The lungs are clear to auscultation. Skin examination shows several scattered erythematous macules with 1- to 2-mm central yellow-white papules on the anterior chest and back. Which of the following is the most appropriate next step in management?

A $5$-year-old girl is brought to the emergency department by her parents due to a rapidly worsening headache, fever, and recurrent vomiting over the past $24$ hours. Upon arrival, the patient is lethargic and only opens her eyes to painful stimuli. Her temperature is $39.5^\circ\text{C}$ ($103.1^\circ\text{F}$), blood pressure is $130/85\text{ mmHg}$, heart rate is $58\text{/min}$, and respiratory rate is $14\text{/min}$. Neurologic examination reveals marked nuchal rigidity and bilateral papilledema on fundoscopy.

Arrange the following management steps in the optimal sequential order for this patient.

A 4-year-old boy is brought to the pediatric clinic by his parents due to a 6-day history of green nasal discharge, nasal congestion, and a daytime cough. His parents are concerned because his older sister recently required antibiotics for pneumonia. He has a history of an isolated wheezing episode at age 14 months, for which he received no daily medications. He is currently due for his routine 4-year-old immunizations. His temperature is 37.6°C (99.7°F), heart rate is 105/min, and respiratory rate is 22/min. Physical examination shows a playful child in no acute distress. The nasal turbinates are erythematous and swollen with visible purulent secretions. The posterior pharynx has mild erythema but no exudates or tonsillar enlargement. Ausculation of the lungs reveals clear breath sounds bilaterally. A few scattered, blanching, erythematous macules are noted on the child's anterior chest. Which of the following is the most appropriate next step in management?

A $6$-year-old boy is brought to the clinic by his father due to a $24$-hour history of left eye redness and swelling. The father reports that the child sustained a mosquito bite near his left eyebrow $3$ days ago. Yesterday, the area became red, and this morning his eye was swollen shut. The boy has been eating and drinking normally and has had no rhinorrhea or sinus pain. Temperature is $37.6^\circ\text{C}$ ($99.7^\circ\text{F}$), heart rate is $98/\text{min}$, respiratory rate is $20/\text{min}$, and blood pressure is $100/65\text{ mmHg}$. On physical examination, the left upper and lower eyelids are severely edematous, warm, and erythematous, preventing the patient from opening the eye spontaneously. With gentle manual retraction of the eyelids, the sclera and conjunctiva appear clear without chemosis. The pupils are equal, round, and reactive to light. Visual acuity is $20/20$ in both eyes. Extraocular movements are fully intact in all directions, and the patient denies pain with eye movement. There is no proptosis. Which of the following is the most appropriate next step in the management of this patient?

A physician evaluates a $24$-day-old neonate in the emergency department who presents with progressive respiratory distress and a truncal eruption. The parents note that the symptoms began two days ago with nasal congestion and reduced breast milk intake, following close contact with a sick preschool-aged sibling. The neonate was delivered at term without complications. Current vital signs include a temperature of $37.9^\circ\text{C}$ ($100.2^\circ\text{F}$), pulse of $158/\text{min}$, respirations of $66/\text{min}$, and oxygen saturation of $93\%$ on room air. Cardiopulmonary auscultation reveals prolonged expiration, diffuse polyphonic wheezing, and bilateral fine crackles, accompanied by visible subcostal retractions. Dermatologic evaluation shows scattered erythematous macules on the anterior chest and back; several macules have small, central, yellow-white pustules. A rapid microscopic evaluation of the pustular fluid reveals a dense infiltration of eosinophils. Which of the following is the most appropriate clinical intervention?

A 3-year-old boy is brought to the emergency department by his parents with a 24-hour history of high fever and a new-onset limp. Today, he completely refuses to bear weight on his right leg. His temperature is 39.2°C (102.6°F), blood pressure is 95/60 mmHg, heart rate is 135/min, and respiratory rate is 26/min. On physical examination, the right hip is held in a position of flexion, abduction, and external rotation. Any attempted passive movement of the right hip elicits severe pain and inconsolable crying. Laboratory results reveal a leukocyte count of 19,500/mm³ and an erythrocyte sedimentation rate of 65 mm/h. Arrange the following acute management steps in the most appropriate sequential order.

The parents of a 14-day-old boy bring him to the emergency department in mid-winter due to a progressively worsening cough, nasal congestion, and a rectal temperature of 38.3°C (100.9°F) at home. He was born full-term following an uncomplicated pregnancy. His state newborn screening report recently returned flagged for undetectable T-cell receptor excision circles (TRECs), and an immunology consultation is scheduled for next week. In the emergency department, his temperature is 38.4°C (101.1°F), heart rate is 175/min, and respiratory rate is 72/min. Physical examination demonstrates nasal flaring, subcostal retractions, and bilateral diffuse wheezing and crackles. The physician notes scattered erythematous macules with 1- to 2-mm central yellow pustules on his trunk and proximal extremities, which the parents state have waxed and waned since his second day of life. A rapid multiplex viral polymerase chain reaction assay of nasopharyngeal secretions is positive for respiratory syncytial virus. The parents ask if he can receive his first dose of the oral rotavirus vaccine today since they missed their primary care appointment. Which of the following is the most appropriate next step in the management of this patient?

An unvaccinated 14-month-old female toddler is evaluated in the outpatient clinic in late autumn. She has a medical history of tetralogy of Fallot and 22q11.2 deletion syndrome (DiGeorge syndrome). Her parents report she has been experiencing intense, exhausting bouts of coughing for the past four days. These episodes are often followed by a high-pitched inspiratory sound and occasional vomiting. Two weeks prior, she had mild nasal congestion and a low-grade temperature that seemingly resolved. Her temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), heart rate is $145/\text{min}$, and respiratory rate is $42/\text{min}$. On physical examination, the toddler appears fatigued. There are scattered, pinpoint, non-blanching red macules on her face and neck. Lung auscultation is clear between the coughing spasms.

Which of the following is the most appropriate next step in management?

An unimmunized 4-year-old male is rushed to the emergency department by emergency medical services after an acute onset of high fever and severe dysphagia. Upon arrival, the patient is observed to be toxic-appearing, drooling, and sitting in a tripod position with a hyperextended neck. Audible inspiratory stridor is present. His temperature is 39.6°C (103.3°F), heart rate is 148/min, and respiratory rate is 38/min. Oxygen saturation is 93% on room air. The clinical presentation is highly suspicious for a life-threatening supraglottic infection. Arrange the following management steps in the most appropriate chronological sequence for this patient.

An 8-month-old infant girl is evaluated in the pediatric clinic during mid-winter for a three-day history of nasal congestion and a subjective low-grade fever. Today, her parents noticed that she developed a raspy cough and is breathing faster than usual. She has been feeding slightly less than normal but continues to have an adequate number of wet diapers. Her medical history is unremarkable, and she is up to date on all recommended immunizations. On physical examination, her temperature is $37.8^\circ\text{C}$ ($100.0^\circ\text{F}$), heart rate is $135/\text{min}$, respiratory rate is $56/\text{min}$, and oxygen saturation is $95\%$ on room air. The infant appears mildly fussy but is easily consolable. Auscultation of the chest reveals diffuse expiratory wheezing and scattered crackles bilaterally, accompanied by mild subcostal retractions. Which of the following is the most appropriate next step in the management of this patient?

Match each pediatric patient's clinical presentation to the most likely causative pathogen.

During a routine morning nursery round, a physician evaluates a newborn male at 48 hours of life. The infant was delivered vaginally at 39 weeks gestation to a 22-year-old primigravida who received limited prenatal care. Maternal admission laboratory screening for HIV, hepatitis B, and syphilis were negative, but her Group B Streptococcus status was unknown. The newborn is breastfeeding vigorously and has had appropriate wet diapers and meconium passage. Vital signs show a temperature of 37.1 °C (98.8 °F), heart rate of 142/min, and respiratory rate of 42/min. Physical examination reveals an alert, well-appearing infant. There is a diffuse cutaneous eruption consisting of multiple 2- to 3-mm firm, yellowish pustules, each surrounded by a prominent erythematous macular base. The lesions are scattered across the chest, abdomen, and proximal thighs, but the palms and soles are completely clear. Mucous membranes are moist without lesions. Which of the following is the most appropriate next step in the management of this patient?