Mumps
A highly contagious viral infection that causes painful swelling of the salivary glands in the cheeks and jaw.
Emergency Management: Mumps encephalitis, presenting with altered mental status, seizures, and focal neurological deficits, requires hospital admission and supportive intensive care.
Mumps is an acute, contagious systemic viral infection caused by the Mumps virus (a paramyxovirus). It is classically characterized by painful swelling of one or both parotid salivary glands, though it can also affect the CNS, testes, and pancreas.
Detailed Overview
Before the introduction of the routine MMR vaccine in 1967, mumps was a ubiquitous childhood disease. Today, outbreaks still occur, primarily in close-contact settings such as college campuses, even among vaccinated individuals due to waning immunity. The disease is usually self-limiting, but post-pubertal infection carries a higher risk of complications like epididymo-orchitis, which can rarely cause infertility. Supportive care remains the cornerstone of treatment.
Epidemiology & Demographics
Incidence dropped by >99% in the US post-vaccine. However, periodic outbreaks occur in young adults (18-25 years). It is highly contagious, spread via respiratory droplets.
Etiological Mechanism
Caused by the Mumps virus, an enveloped, negative-sense, single-stranded RNA virus of the Paramyxoviridae family, genus Rubulavirus.
Primary Causes
Transmission via inhalation of respiratory droplets
Direct contact with infected saliva or fomites
The virus enters via the respiratory tract and infects the upper respiratory mucosal epithelium. It replicates locally and in draining lymph nodes, followed by primary viremia. The virus has a tropism for glandular and central nervous system tissues. It seeds the parotid glands, testes, ovaries, pancreas, and meninges. In the parotid gland, viral replication causes edema, lymphocytic infiltration, and desquamation of necrotic epithelial cells lining the salivary ducts, leading to the characteristic swelling.
Diagnostic Criteria & Guidelines
Clinical diagnosis based on characteristic parotitis in the context of an outbreak. Confirmed via laboratory testing for public health tracking: positive serum mumps IgM, or mumps RNA by RT-PCR from a buccal swab.
Treatment is entirely supportive. Acetaminophen (650 mg PO q6h) or Ibuprofen (400 mg PO q6h) for pain and fever control. Warm or cold packs to the parotid area. Hydration and a soft, bland diet to minimize chewing pain.
Second-Line & Adjunctive Therapy
For severe mumps orchitis: Bed rest, scrotal elevation, ice packs, and NSAIDs. In severe, refractory cases of orchitis, a short course of systemic corticosteroids (e.g., Prednisone) is sometimes used to reduce edema, though evidence of efficacy is limited.
Surgical & Procedural Management
None indicated.
Patient Counseling & Advice
Advise the patient on the highly contagious nature of the virus and the need for isolation. Explain that swelling will resolve in about a week. In adult males, warn about the risk of orchitis and instruct them to seek medical care if severe scrotal pain develops.
Follow-Up & Monitoring Schedule
Outpatient follow-up generally not required unless complications like severe abdominal pain, severe headache, or scrotal swelling occur.
Preventive Strategies
Routine immunization with the live-attenuated MMR vaccine: 1st dose at 12-15 months, 2nd dose at 4-6 years. A 3rd dose may be recommended by public health authorities during a targeted outbreak.
Excellent. Most patients recover completely within 2 weeks. Fatalities are exceedingly rare and usually linked to severe encephalitis.