More than a dozen cases of mumps have been reported at Loyola University Maryland in the last month, The Baltimore Sun reported. The mumps vaccine has largely removed mumps as a common health problem in the United States, but when outbreaks have broken out, college campuses have been places where mumps can spread quickly. Loyola officials have informed all students and employees of the outbreak, but an incubation period of two weeks prior to symptoms can make it difficult to identify all of those at risk.