During measles outbreaks, it is important to be able to rapidly distin- guish between measles cases and vaccine reactions to avoid unnecessary outbreak response measures such as case isolation and contact investigations.
Since approximately 5% of recipients of measles virus-containing vaccine experience rash and fever which may be indistinguishable from measles, it is very important to identify vaccine reactions…
Recent measles outbreaks in the Canadian provinces of Alberta and British Columbia have emphasized the need for rapid differentiation of vaccine reactions from reactions to infection with the wild-type virus.
During the measles outbreak in California in 2015, a large number of suspected cases occurred in recent vaccinees.