Review Question - QID 106713

A 9-year-old boy is brought to the emergency room by his concerned mother after he "urinated blood." The boy reports that, starting this morning, he experienced significant pain with urination and his urine appeared a bright red color. These symptoms were not present before today; however, he reports a cough, runny nose, and sore throat that started approximately 3 days ago. Vital signs are as follows: T 38.4 deg C, HR 101, BP 110/65, RR 14, SpO2 99%. Physical examination is significant for bilateral conjunctivitis, tenderness to suprapubic palpation, and a small amount of clotted blood is noted surrounding the urethral meatus. A urine sample is obtained, and urinalysis shows 3+ blood, and urine microscopy demonstrates gross blood with too many cells to count per high powered field. Which of the following is the most common viral cause of this child's condition?