Pediatric Infectious Diseases

A $48$-hour-old term female newborn is evaluated in the nursery for a new skin eruption. The infant was born at $39$ weeks gestation via uncomplicated vaginal delivery to a $25$-year-old primigravid mother. The mother's prenatal screening laboratory tests were unremarkable, although she reports having had a mild, self-resolving upper respiratory tract illness $2$ weeks prior to delivery. The infant is exclusively breastfeeding every $2$ to $3$ hours and is producing normal wet and soiled diapers. Vital signs include a temperature of $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), heart rate of $135\text{/min}$, and respiratory rate of $42\text{/min}$. On physical examination, the newborn appears comfortable and alert. Skin examination reveals a widely distributed rash consisting of $2$- to $3$-mm blanching, erythematous macules, many of which contain central, firm, $1$-mm yellow-white pustules. The lesions are prominent on the trunk and face, but the palms and soles are completely spared. There is no associated lymphadenopathy, hepatosplenomegaly, or neurologic deficit. A complete blood count demonstrates a leukocyte count of $16,500/\text{mm}^3$ with an eosinophil fraction of $8\%$. Which of the following is the most appropriate next step in the management of this patient?

A full-term male newborn is evaluated in the hospital nursery on his third day of life. The parents express concern about a sudden skin eruption that appeared on his chest and arms earlier this morning. The infant was born via uncomplicated spontaneous vaginal delivery to a 28-year-old primigravida mother who had regular prenatal care and tested negative for Group B Streptococcus. He is breastfeeding vigorously and producing adequate wet diapers. Vital signs include a temperature of 37.0°C (98.6°F), heart rate of 138/min, and respiratory rate of 40/min. Physical examination reveals a well-appearing, alert neonate. Skin examination shows scattered 1- to 2-mm yellow pustules, each surrounded by a large, irregularly shaped erythematous macule. The lesions are present on the trunk, back, and proximal extremities, but the palms and soles are completely spared. No other abnormalities are noted. Which of the following is the most appropriate next step in management?

Match each clinical presentation of a pediatric exanthem with its most likely causative viral pathogen.

A 9-year-old girl is brought to the outpatient pediatric clinic by her father due to a persistent cough that has worsened over the past 14 days. The cough is dry, hacking, and most prominent at night. She also reports mild fatigue, a low-grade fever, and a dull headache. She has no history of asthma or environmental allergies, and her immunizations are up to date. Vital signs show a temperature of 37.9°C (100.2°F), heart rate of 98/min, respiratory rate of 22/min, and oxygen saturation of 98% on room air. She appears comfortable and is in no acute distress. Lung auscultation reveals faint bilateral wheezes and scattered fine crackles. A chest radiograph demonstrates diffuse, patchy interstitial infiltrates. Which of the following is the most appropriate next step in management?

A 6-year-old boy is brought to the pediatric emergency department with a 2-day history of high fever, severe headache, and progressively worsening lethargy. His parents recently immigrated, and his immunization status is unknown. Temperature is 39.8°C (103.6°F), blood pressure is 112/72 mmHg, pulse is 135/min, and respiratory rate is 24/min. On physical examination, the child is somnolent but arousable to painful stimuli. Marked nuchal rigidity is present. Neurologic examination reveals a sluggish left pupillary reflex and right-sided pronator drift. Arrange the following steps in the most appropriate sequential order for the acute management of this patient.

An evaluation is requested for a $28$-day-old male infant who presents to the outpatient clinic in late January with worsening nasal congestion, poor sleep, and a mild cough over the past $3$ days. The parents also inquire about a facial rash that erupted two days ago. The infant's $5$-year-old sister has severe asthma and recently missed school due to an upper respiratory infection. The infant was born at $39$ weeks gestation with no perinatal complications. He is breastfeeding slightly less than usual but has adequate urine output. Vital signs include a temperature of $37.3$°C ($99.1$°F), pulse of $152$/min, and respirations of $54$/min. Oxygen saturation is $95$% on room air. Physical examination reveals a well-hydrated, non-toxic appearing infant with copious clear rhinorrhea. Lung auscultation demonstrates prolonged expiration, diffuse high-pitched wheezes, and mild subcostal retractions. Skin examination of the forehead and cheeks shows scattered $1$- to $2$-mm erythematous papules and pustules without comedones. Which of the following is the most appropriate next step in management?

During a winter afternoon clinic session, a physician evaluates a 4-year-old female for a worsening cough. According to her parents, she initially developed a runny nose and a mild temperature three days ago. Over the past 24 hours, her temperature has spiked to 39.4°C (102.9°F), and she has become more fatigued, though she continues to drink fluids adequately. Her immunizations are current for her age. Vitals show a temperature of 39.4°C (102.9°F), pulse of 130/min, respirations of 44/min, and oxygen saturation of 97% on room air. The child appears tired but non-toxic. Pulmonary auscultation reveals localized crackles and bronchial breath sounds over the right lower lung field, with no wheezing or intercostal retractions. What is the most appropriate empiric pharmacotherapy for this patient?

A 10-month-old boy is brought to the pediatric clinic by his parents due to a new-onset skin eruption. For the past three days, the infant experienced a high fever, with home temperature readings reaching up to 39.8°C (103.6°F). Despite the elevated temperature, he remained playful and continued to breastfeed normally. Early this morning, the fever abruptly resolved. A few hours later, the parents noticed a pink, blanching, maculopapular rash that began on his chest and abdomen before spreading to his neck and proximal extremities. His only other symptom is mild, clear rhinorrhea. He has received all age-appropriate vaccinations up to his 6-month well-child visit. His current temperature is 37.1°C (98.8°F), pulse is 110/min, and respiratory rate is 24/min. Physical examination confirms the maculopapular exanthem and reveals mild suboccipital lymphadenopathy. Lung auscultation is clear bilaterally. Which of the following is the most appropriate next step in management?

Evaluate the following neonatal clinical scenarios and match each patient's presentation with the most appropriate targeted pharmacologic therapy or initial management strategy.

A 3-year-old girl is brought to the pediatric emergency department due to high fever, worsening cough, and difficulty breathing. She had a mild runny nose and cough for 3 days, but today her temperature spiked to 39.4°C (102.9°F) and her work of breathing increased significantly. She has vomited all oral intake over the past 12 hours. Her past medical history is unremarkable, and she is up to date with all childhood immunizations, including the pneumococcal conjugate and Haemophilus influenzae type b vaccines. Vital signs show a heart rate of 155/min, respiratory rate of 52/min, blood pressure of 92/60 mmHg, and oxygen saturation of 90% on room air. Physical examination reveals a moderately ill-appearing child with nasal flaring and subcostal retractions. Auscultation of the lungs demonstrates decreased breath sounds and focal crackles over the right lower lung field. A chest radiograph reveals a dense right lower lobe consolidation with a small, simple parapneumonic effusion. The patient is admitted to the pediatric ward and placed on supplemental oxygen. Which of the following is the most appropriate empiric pharmacotherapy for this patient?

A father brings his 14-month-old daughter to the primary care clinic because she has been unusually irritable and consistently rubbing her ears for the past two days. She developed a clear nasal discharge and a mild cough earlier in the week. Her temperature in the clinic is 38.6°C (101.5°F), heart rate is 130/min, and respiratory rate is 28/min. She has not been exposed to any known sick contacts outside the home, does not attend daycare, and has no history of medication allergies. Her last course of antibiotics was prescribed at age 4 months for a localized skin infection. On physical examination, she appears fussy but consolable. Otoscopy reveals that both tympanic membranes are bulging, vividly erythematous, and lack mobility upon pneumatic insufflation. The lungs are clear to auscultation bilaterally. Which of the following is the most appropriate initial treatment for this patient?

Match each classic pediatric respiratory clinical presentation (left) with its most likely causative microbiologic agent (right).

Routine rounding in the normal newborn nursery involves the examination of a 48-hour-old full-term neonate. The pregnancy was uncomplicated, and maternal group B Streptococcus screening was negative. The neonate is feeding well and has not had any documented fevers. However, the parents are highly anxious about a new, widespread skin eruption that appeared earlier this morning. Physical examination reveals multiple 2- to 3-mm pale yellow pustules surrounded by a prominent erythematous base, distributed over the chest, abdomen, and proximal extremities. The palms and soles are completely spared. Vital signs, including temperature, are within normal physiological limits for age. Which of the following is the most appropriate next step in the management of this patient?

Match each pediatric patient's clinical presentation of lymphadenopathy with the most likely causative infectious organism.

A 9-year-old boy is brought to the pediatrics clinic by his father due to a persistent cough for the past two weeks. The cough is dry, nonproductive, and frequently disrupts the patient's sleep. Over the past few days, he has also developed a mild sore throat, malaise, and a low-grade fever. His past medical history is unremarkable, and his immunizations are up to date. His temperature is 37.9°C (100.2°F), blood pressure is 105/65 mm Hg, pulse is 95/min, and respiratory rate is 22/min. Pulse oximetry shows 98% on room air. The patient appears comfortable and is in no acute distress. Physical examination of the chest reveals diffuse, bilateral fine crackles and occasional expiratory wheezes. A chest radiograph demonstrates bilateral, patchy interstitial infiltrates without pleural effusions or focal lobar consolidation. What is the most appropriate next step in management?

A $5$-month-old girl is brought to the outpatient clinic in late December due to a $3$-day history of nasal congestion, copious clear rhinorrhea, and a worsening cough. Her oral intake has decreased slightly, but she continues to have wet diapers. During the visit, her mother expresses concern that the infant is not yet able to sit up without support. The patient was born at full term and has received all age-appropriate vaccinations. Her temperature is $37.9^\circ\text{C}$ ($100.2^\circ\text{F}$), pulse is $148/\text{min}$, respirations are $58/\text{min}$, and pulse oximetry shows $95\%$ on room air. Physical examination reveals mild subcostal retractions. Auscultation of the lungs demonstrates diffuse bilateral wheezing and scattered crackles. Which of the following is the most appropriate next step in management?

An $8$-year-old boy is brought to the emergency department due to a $2$-day history of worsening headache, high fever, and generalized lethargy. Over the last $12$ hours, he has become increasingly difficult to arouse. His temperature is $39.4^\circ\text{C}$ ($102.9^\circ\text{F}$), blood pressure is $110/70\text{ mmHg}$, pulse is $125/\text{min}$, and respiratory rate is $22/\text{min}$. Physical examination reveals a somnolent child who only opens his eyes to painful stimuli. He has marked nuchal rigidity. Funduscopic examination shows bilateral blurring of the optic disc margins. There are no focal neurologic deficits or purpuric rashes. Arrange the following steps in the most appropriate sequential order for managing this patient's acute presentation.

Match each clinical vignette describing a neonate with a congenital infection to the most likely causative pathogen.

A male neonate, aged 16 days, is evaluated in the emergency department in mid-winter due to a 24-hour history of poor feeding, rhinorrhea, and a documented axillary temperature of 38.4°C (101.1°F). He was born at 39 weeks gestation via uncomplicated vaginal delivery and discharged on day 2 of life. On physical examination, the patient appears well-perfused but exhibits mild tachypnea with a respiratory rate of 64/min. Auscultation of the chest reveals diffuse high-pitched expiratory wheezing and mild intercostal retractions. Dermatologic examination shows a splotchy, erythematous macular rash with central tiny yellow papules scattered across the chest and abdomen. A rapid antigen detection test for respiratory syncytial virus (RSV) returns positive. What is the most appropriate single best action in the management of this patient?

A mother brings her 4-week-old infant to the pediatric emergency department during the winter season. Over the past three days, the infant has developed a progressive cough, copious clear rhinorrhea, and fast breathing. Today, the mother noticed the baby is having difficulty feeding and seems unusually lethargic. The infant was born at 39 weeks of gestation following an uncomplicated pregnancy and delivery. Family history is significant for a father with severe persistent asthma.

Vital signs reveal a temperature of 37.3°C (99.1°F), a heart rate of 152/min, a respiratory rate of 70/min, and an oxygen saturation of 91% on room air. Physical examination demonstrates an infant in moderate respiratory distress with nasal flaring and marked intercostal retractions. Auscultation reveals prolonged expiration with diffuse bilateral wheezing and fine crackles. Skin examination shows scattered, blotchy, erythematous macules with central tiny pale papules on the trunk, which the mother states have intermittently appeared and resolved since the first week of life.

Based on the clinical presentation, which of the following is the most appropriate next step in management?