<prompt> Most common complications of Mumps isOrchitis and OophoritisEncephalitisPneumoniaMyocarditis  <response>: At least one-third of all mumps infections are subclinical, including the majority of infections in children younger than 2 years. The most characteristic feature of symptomatic cases is swelling of the salivary glands, which occurs in about 50 of patientsThe testes and ovaries may be affected, especially after pubey. Around 20-50 of men who are infected with mumps virus develop orchitis often unilateral.Jawetz 27e pg: 589 