(HealthDay News) -- Mumps are a caused by a virus, normally during childhood, and carried via saliva. Since most children in developed nations are vaccinated against mumps at a young age, the disease is fairly uncommon in these areas.

But infection in children and even adults is still a possibility, and the Nemours Foundation offers these warning signs:

• Swollen parotid salivary glands, which are located at the back of the jaw and each cheek. The area between the jaw and the ears becomes swollen and painful.
• Fever of up to 103 degrees Fahrenheit.
• Headache.
• Loss of appetite.
• Pain when talking, swallowing, chewing or drinking acidic beverages like soda or orange juice.

Left untreated, complications from mumps could include encephalitis and meningitis. Mumps is a very contagious virus, but it cannot be treated with antibiotics, which are effective only on bacterial infections.

If you suspect a family member or loved one has mumps, have the person see a doctor as soon as possible.