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  1. RNA virus of the genus Paramyxovirus
  2. Incubation period ranges from 14–24 days
  3. Age group involved: 5-15yrs.
  4. Man is the only reservoir.
  5. Infection airborne and direct contact or fomites.
  6. 30–40% of infections are subclinical
  7. Virus has been isolated from saliva 6 days prior to 9 days after the onset of parotid swelling. Q
  8. Transmission does not seem to occur more than 24hr before the appearance of the swelling or later than 3 days after it has subsided.
  9. Virus has been isolated from urine from the 1st–14th day after the onset of salivary gland swelling
  10. Salivary manifestation: enlarged parotid obliterates the mandibular angle.
  11. U/L in 25% and B/L in 75% cases. Q
  12. Disappears in 6-10 days.
  13. In 10–15% of patients only the submandibular gland(s) may be swollen. 


  1. Meningoencephalitis is the most frequent complication in childhoodQ. Males are affected three to five times as frequently as females.. The cerebrospinal fluid may show a lymphocytic pleocytosis of less than 500 cells/ mm3 
  2. Orchitis And Epididymitis.
    1. These complications rarely occur in prepubescent boys but are common (14–35%) in adolescents and adults. The testis is most often infected with or without epididymitis; epididymitis may also occur alone.
    2. Bilateral orchitis occurs in approximately 30% of patients. Q
    3. Approximately 30–40% of affected testes atrophy, leaving a cosmetic imbalance.
    4. Infertility is rare even with bilateral orchitis. Q 
  3. Oophoritis.
    Pelvic pain and tenderness are noted in about 7% of postpubertal female patients.
    1. Auditory nerve damage.      
    2. Cerebellar ataxia.
    3. Facial ataxia.               
    4. GBS                      
    5. Transverse myelitis. 
  4. Pancreatitis Q
  5. Nephritis
  6. Others: myocarditis , thyroiditis , mastitis and ocular complications (dacryoadenitis) Q.
  7. Migratory polyarthralgia and even arthritis are occasionally seen in adults with mumps but are rare in children
  8. Increase serum amylaseQ

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