In atopic dermatitis, the presence of punched-out erosions, vesicles, and infected skin lesions that fail to respond to oral antibiotics suggests infection with

Correct Answer: B

Rationale: Eczema herpeticum caused by Herpes simplex virus presents with punched-out erosions.

Correct Answer: D

Rationale: Pediatrician concern alone may not be sufficient to raise suspicion without corroborating evidence from parents, caregivers, or other involved parties.

Correct Answer: D

Rationale: Thelarche typically occurs between ages 8-13, marking the start of female puberty.

Correct Answer: D

Rationale: Chest compressions in infants are done using 2 fingers in the center of the chest, ensuring adequate depth and avoiding excessive pressure on fragile ribs.

Correct Answer: D

Rationale: Sodium is primarily distributed in extracellular fluid, with a volume of distribution of about 0.6 times total body weight, including interstitial and intravascular compartments.