A 5-day-old newborn has bleeding from the umbilical stump. Most likely cause?

Which organelle is known as the “powerhouse” of the cell?

A 6-year-old with bleeding gums, petechiae, and poor wound healing eats no fruits or vegetables. Diagnosis?

A vegan adolescent has megaloblastic anemia and paresthesias. Which deficiency explains this?

A 3-year-old with chronic diarrhea develops perioral dermatitis, alopecia, and poor wound healing. Which micronutrient is deficient?

A malnourished child presents with confusion, ophthalmoplegia, and ataxia. Which vitamin is deficient?

Which type of epithelium lines blood vessels and lymphatics?

A 4-year-old develops multiple golden-yellow crusted lesions around the nose and mouth after an insect bite. The most likely causative agent is:

A 6-year-old presents with restlessness, fever, and difficulty swallowing water, leading to spasms. He was bitten by a stray dog 2 weeks ago and did not receive vaccination.
What is the diagnosis?

A 3-year-old has creamy white plaques on the tongue that can be scraped off, leaving a red base. The mother says the child recently took antibiotics for otitis media.
Most probable diagnosis:

A child has paroxysmal cough with inspiratory “whoop.” Lymphocytosis is present. Causative organism?

A term newborn delivered after fetal distress develops respiratory distress. CXR shows patchy infiltrates. Likely diagnosis?

A 5-year-old with fever, drooling, muffled voice, and tripod position. X-ray shows "thumb sign." What is the most likely pathogen?

A 6-year-old with recurrent sinusitis, bronchiectasis, and situs inversus. What is the underlying defect?

A 10-year-old boy has recurrent wheezing and nighttime cough. Spirometry shows reversible airway obstruction. Which cell type plays a key role in the pathogenesis?

A 2-year-old suddenly develops coughing and unilateral wheezing while eating peanuts. Which lung is most likely affected?

A 6-month-old presents with cough, wheezing, and difficulty breathing. CXR shows hyperinflation. The most likely causative agent is:

A premature newborn develops respiratory distress within minutes of birth. CXR shows a "ground-glass" appearance. Which of the following is deficient?

A 3-year-old child presents with recurrent pneumonia, failure to thrive, and foul-smelling stools. Sweat chloride test is 85 mmol/L. Which of the following is the most likely cause of this condition?