<prompt> A 21-year-old man presents with symptoms of headache, fever, chills, and discomfort in both sides of his jaw. He has also noticed discomfort in his testes, but no dysuria or urethral discharge. Physical examination reveals bilateral enlargement of the parotid glands, as well as bilateral testicular enlargement and tenderness on palpation. His temperature is 38.5degC pulse rate of 92min, and the remaining examination is normal. Laboratory data show hemoglobin 15 gdL; hematocrit 40; WBC 12000mL, with 30 segmented neutrophils, 8 monocytes, and 62 lymphocytes. Which of the following statements concerning this disease is true?the disease is caused by a herpesvirusthe incubation period is 3-5 daysthe most common complication of this disease in post-pubertal boys and men is orchitisrecurrent infections may occur  <response>: Orchitis occurs in about 20 of males, but is usually unilateral, thus sterility is rare. The disease is caused by a paramyxovirus and one infection confers lifelong immunity. The incubation period is 14-18 days. Serum amylase is elevated in most cases of mumps because of parotitis, not pancreatitis. Other complications include thyroiditis, myocarditis, and polyarthritis. 