A 2-day-old neonate is admitted to the neonatal intensive care unit after being noted to have a heart murmur and dysmorphic facial features. On further evaluation, the infant is found to have a conotruncal cardiac defect, cleft palate, and hypocalcemia. The neonate also has a history of recurrent infections. These findings raise concern for a genetic syndrome associated with aberrant development of certain embryologic structures. Which embryologic abnormality is most commonly responsible for the constellation of findings seen in this neonate, including conotruncal cardiac defects, abnormal facies, thymic hypoplasia, cleft palate, and hypocalcemia (commonly known as CATCH 22)?

A 55-year-old woman presents to the rheumatology clinic with complaints of progressive difficulty swallowing, recurrent heartburn, and intermittent cold-induced color changes in her fingers. She has also noticed firm, tight skin on her fingers, making it difficult to fully extend them. Additionally, she reports the appearance of red spots on her face and hands over the past year. She denies any joint pain, fevers, or weight loss. History & Physical Examination Past Medical History: Long-standing Raynaud’s phenomenon affecting her fingers, first noticed in her 40s. Family History: No known autoimmune disorders. Social History: No smoking or alcohol use. Medications: Occasional use of ibuprofen for headaches. Physical Examination: Vitals: Normal temperature, BP: 130/85 mmHg, HR: 78 bpm. Hands: Tight, thickened skin over the fingers (sclerodactyly). Raynaud’s phenomenon: Color changes in fingers upon cold exposure (white → blue → red). Face & Extremities: Telangiectasias (small red spots) over the face and hands. No synovitis or joint swelling. GI Examination: No tenderness. No hepatosplenomegaly. Which of the following findings is most characteristic of this patient’s condition?

A 1-year-old girl is brought to the clinic with a 3-day history of high fever (up to 39.5°C). The mother reports that the fever abruptly resolved this morning, but she noticed a pink, maculopapular rash on the child’s chest and back. The child is playful and alert with no respiratory or gastrointestinal symptoms. On examination, the rash is blanching and non-pruritic, primarily affecting the trunk and spreading to the neck and arms. Question: Which of the following viruses is most likely responsible for this condition?