Because of large-scale vaccination campaigns, diseases such as measles, mumps, and pertussis have reached levels of elimination or near-extinction. In recent years, however, there has been an increase in the incidence of these vaccine-preventable diseases in the United States and abroad. For example, there were 667 reported cases of measles in the United States in 2014; a record number since the disease was declared eliminated in 2000 by public health officials…
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