CDC released a statement discussing the deaths associated with Yellow Fever Vaccinization, in Peru. See original post on subject here. A total of four deaths have been associated with the YF vaccine, given in Peru, as a governmental response to potential outbreaks.
The vaccines implicated are all from the same lot numbers and manufacturer: Bio-Manguinos in Brazil. The investigators are still attempting to determine if there is a problem with the vaccine itself or a unique reaction to the vaccine, only in those who died.