Mumps is a common contagious disease with relatively moderate symptoms during childhood, but increasing complications when adults are infected. The causative virus belongs to Paramyxoviridae family. Both infection or vaccination with Mumps virus leads to persistent immunity. The immunity levels are monitored by IgG EIA tests. Increasing IgG titres are helpful in determining the causative agent and ruling out cross reactions with Parainfluenza Type 2 virus. IgM antibody titres are monitored in the early stage of the disease.