- Published on
Emergency and Acute Medicine – Mumps
Mumps is a vaccine-preventable infectious disease characterized primarily by inflammation and swelling of the salivary glands, most notably the parotid glands. The disease is caused by a single-stranded RNA virus of the Rubulavirus genus within the Paramyxovirus family, with humans as the only known reservoir. Widespread vaccination has significantly reduced incidence, but outbreaks still occur, particularly in unvaccinated or underimmunized populations.
Transmission occurs through respiratory droplets, saliva, and contact with contaminated fomites. After replication in the nasopharynx and regional lymph nodes, the virus disseminates hematogenously to target organs, including the salivary glands, pancreas, testes, ovaries, and meninges. The incubation period is typically 14 to 18 days. Patients are contagious from approximately one week before symptom onset until about six days after symptoms begin. A history of incomplete or absent immunization is common.
Clinical illness often begins with a prodrome of low-grade fever, headache, malaise, myalgia, anorexia, otalgia, and jaw pain, which may precede glandular swelling by up to 48 hours. Up to 20 percent of infections are asymptomatic but remain contagious. Approximately half of patients may present with nonspecific upper respiratory symptoms without obvious salivary gland enlargement. Parotitis is the most common clinical manifestation and occurs in the majority of symptomatic cases, presenting as painful, tender unilateral or bilateral enlargement of the parotid glands. Swelling is bilateral in most cases, and the overlying skin remains nonerythematous. Symptoms typically peak within several days and resolve by the tenth day.
Complications are more frequent and severe in adults than in children. Orchitis is the most common complication in postpubertal males and may occur before, during, or after parotitis. It presents with abrupt onset of painful testicular swelling, fever, nausea, and vomiting. Although testicular atrophy may develop in a significant proportion of patients, infertility is rare. Oophoritis may occur in postpubertal females and can mimic appendicitis but does not impair fertility. Pancreatitis may develop with fever, nausea, vomiting, epigastric pain, and transient hyperglycemia, and in severe cases may progress to shock.
Central nervous system involvement includes aseptic meningitis, which occurs in a minority of patients and usually resolves without sequelae, and encephalitis, which is rare but serious. Other neurologic complications include sensorineural hearing loss, typically unilateral and often permanent, cerebellar ataxia, and transverse myelitis. Additional rare complications include myocarditis, glomerulonephritis, polyarthritis, thrombocytopenic purpura, thyroiditis, mastitis, and ocular involvement.
Diagnosis is primarily clinical, based on the presence of parotitis with compatible systemic symptoms and epidemiologic context. Laboratory testing is not routinely required but may be useful in atypical cases or when confirmation is necessary. Elevated serum amylase due to salivary gland inflammation can support the diagnosis. Definitive diagnosis may be obtained through detection of mumps RNA by polymerase chain reaction, viral culture, or serologic testing demonstrating mumps-specific IgM antibodies or a significant rise in IgG titers. Cerebrospinal fluid analysis is reserved for patients with neurologic symptoms.
Management in the emergency setting is supportive, as no specific antiviral therapy exists. Treatment includes antipyretics, analgesics, adequate hydration, and antiemetics when needed. Ice packs and rest may relieve parotid discomfort. Patients with orchitis benefit from scrotal support, bed rest, and pain control. Infected individuals should be placed on droplet precautions to limit transmission. Vaccination remains the cornerstone of prevention, though it is not effective once infection has occurred.
Hospital admission is reserved for patients with severe complications such as meningitis, encephalitis, significant pancreatitis, or those unable to maintain hydration. Most patients can be safely discharged with instructions regarding isolation and symptom management. Patients are considered contagious until approximately one week after symptom onset.
Key clinical pearls include recognizing that mumps is the only cause of epidemic parotitis and that vaccination provides high levels of immunity when appropriately administered. The mumps vaccine should not be given to pregnant or severely immunocompromised individuals. Despite reduced incidence in many regions, mumps remains endemic worldwide and should be considered in travelers and unvaccinated populations.
Mumps is a vaccine-preventable infectious disease characterized primarily by inflammation and swelling of the salivary glands, most notably the parotid glands. The disease is caused by a single-stranded RNA virus of the Rubulavirus genus within the Paramyxovirus family, with humans as the only known reservoir. Widespread vaccination has significantly reduced incidence, but outbreaks still occur, particularly in unvaccinated or underimmunized populations.
Transmission occurs through respiratory droplets, saliva, and contact with contaminated fomites. After replication in the nasopharynx and regional lymph nodes, the virus disseminates hematogenously to target organs, including the salivary glands, pancreas, testes, ovaries, and meninges. The incubation period is typically 14 to 18 days. Patients are contagious from approximately one week before symptom onset until about six days after symptoms begin. A history of incomplete or absent immunization is common.
Clinical illness often begins with a prodrome of low-grade fever, headache, malaise, myalgia, anorexia, otalgia, and jaw pain, which may precede glandular swelling by up to 48 hours. Up to 20 percent of infections are asymptomatic but remain contagious. Approximately half of patients may present with nonspecific upper respiratory symptoms without obvious salivary gland enlargement. Parotitis is the most common clinical manifestation and occurs in the majority of symptomatic cases, presenting as painful, tender unilateral or bilateral enlargement of the parotid glands. Swelling is bilateral in most cases, and the overlying skin remains nonerythematous. Symptoms typically peak within several days and resolve by the tenth day.
Complications are more frequent and severe in adults than in children. Orchitis is the most common complication in postpubertal males and may occur before, during, or after parotitis. It presents with abrupt onset of painful testicular swelling, fever, nausea, and vomiting. Although testicular atrophy may develop in a significant proportion of patients, infertility is rare. Oophoritis may occur in postpubertal females and can mimic appendicitis but does not impair fertility. Pancreatitis may develop with fever, nausea, vomiting, epigastric pain, and transient hyperglycemia, and in severe cases may progress to shock.
Central nervous system involvement includes aseptic meningitis, which occurs in a minority of patients and usually resolves without sequelae, and encephalitis, which is rare but serious. Other neurologic complications include sensorineural hearing loss, typically unilateral and often permanent, cerebellar ataxia, and transverse myelitis. Additional rare complications include myocarditis, glomerulonephritis, polyarthritis, thrombocytopenic purpura, thyroiditis, mastitis, and ocular involvement.
Diagnosis is primarily clinical, based on the presence of parotitis with compatible systemic symptoms and epidemiologic context. Laboratory testing is not routinely required but may be useful in atypical cases or when confirmation is necessary. Elevated serum amylase due to salivary gland inflammation can support the diagnosis. Definitive diagnosis may be obtained through detection of mumps RNA by polymerase chain reaction, viral culture, or serologic testing demonstrating mumps-specific IgM antibodies or a significant rise in IgG titers. Cerebrospinal fluid analysis is reserved for patients with neurologic symptoms.
Management in the emergency setting is supportive, as no specific antiviral therapy exists. Treatment includes antipyretics, analgesics, adequate hydration, and antiemetics when needed. Ice packs and rest may relieve parotid discomfort. Patients with orchitis benefit from scrotal support, bed rest, and pain control. Infected individuals should be placed on droplet precautions to limit transmission. Vaccination remains the cornerstone of prevention, though it is not effective once infection has occurred.
Hospital admission is reserved for patients with severe complications such as meningitis, encephalitis, significant pancreatitis, or those unable to maintain hydration. Most patients can be safely discharged with instructions regarding isolation and symptom management. Patients are considered contagious until approximately one week after symptom onset.
Key clinical pearls include recognizing that mumps is the only cause of epidemic parotitis and that vaccination provides high levels of immunity when appropriately administered. The mumps vaccine should not be given to pregnant or severely immunocompromised individuals. Despite reduced incidence in many regions, mumps remains endemic worldwide and should be considered in travelers and unvaccinated populations.
0 Comments
