Mumps is a contagious disease typically affecting children and caused by the mumps virus. The characteristic of this disease is the initial onset of headache, loss of appetite, muscle aches, tiredness and fever followed by the typical swelling of one or more salivary glands. The disease is transmitted from one person to the other through saliva and/or droplets. Although the symptoms vanish within few days of infection and are usually mild requiring only symptomatic pain relief, complications can occur in rare cases, which requires immediate medical attention and treatment. Complications can involve infection in testicles (in post-pubertal males), ovaries, prostate gland, thyroid gland, and pancreas. Brain infection is believed to occur in only one in 10,000 cases, but it often leads to death. Although the mumps virus infects mostly children aged five to ten, it can infect adults as well and when it does, it is more likely that the complications are serious. These could be a loss of hearing and loss of fertility. For this reason, the prevention of the disease gets precedence over its cure. Mumps was a common viral disease until the mumps vaccine was launched in 1967. Before the launch of the vaccine, greater than 200,000 cases of mumps occurred each year in the United States.