Image of the Week: Salmon-pink, scaly papules

An 8-year-old boy is brought to the pediatrician by his mother due to concerns of a new-onset rash. He is otherwise healthy, though his mother mentions that he was unwell 2 weeks prior to the rash appearing. On examination, numerous small, salmon-pink, scaly papules are seen on his trunk and extremities. Which of the following infections most likely preceded this ...