Study: Mumps outbreaks linked to vaccine losing efficacy

A string of outbreaks of the mumps virus in Europe and the United States is linked to waning effectiveness of the vaccine, according to a study published Wednesday in Science Magazine.

Study authors Joseph Lewnard and Yonatan Grad write that because the mumps virus has seen a resurgence among older individuals in communities with high-vaccination coverage, the evidence points to the vaccine losing some effectiveness 27 years after inoculation.