A single test revealing a specific IgM antibody can confirm the disease. Acute and convalescent titers of specific IgG antibodies will also confirm the diagnosis of mumps. Urine, saliva, and throat swabs will grow the mumps virus, but blood does not. Salivary amylase is elevated but is relatively nonspecific. Of course, a typical presentation during an epidemic probably does not require any confirmatory tests. Sporadic cases require more active confirmation. Other causes of parotitis requiring specific treatment include calculi, bacterial infections, and drugs. Tumors, sarcoid, TB, leukemia, Hodgkin disease, Sjogren syndrome, and lupus erythematosus can also cause parotid enlargement.