- Mumps is a NOTIFIABLE DISEASE in the UK
- Another viral respiratory tract infection. Caused by the mumps virus.
- Most common in winter/spring
- Spread by droplet infection
- Not as infectious as measles
- Viral replication occurs in epithelial cells of the respiratory tract, before the virus gets into the parotid glands, and then spreads to other tissues.
- After previous infection, immunity is lifelong
- A patient is infectious from about 2 days before clinical signs to up to 9 days afterwards. Many cases are also subclinical, and thus many asymptomatic patients are infectious.
- Intrauterine infection can occur in pregnancy
- Often unilateral initially, becoming bilateral in 70% of cases
- May present as ear ache, or pain on eating and drinking
- The parotid duct may appear swollen and red on examination
Fever – usually lasts 3-4 days
Orchitis – can be present in boys. It is uncommon before puberty, and is usually unilateral. It can sometimes reduce sperm count, but infertility is extremely rare.
- Symptoms are generally less severe in young children, and worse in older children and adults
Meningitis –a CSF picture compatible with meningitis is seen in about 50% of cases. However:
- Only 10% of cases have meningeal symptoms.
Encephalitis – seen in 1 in 5000
Orchitis – can cause infertility