Emergent BioSolutions Inc., of Rockville, Md., said investigational anthrax vaccine NuThrax (anthrax vaccine adsorbed with CPG 7909 adjuvant) was granted fast-track status by the FDA. The candidate, also known as aV7909, consists of BioThrax (anthrax vaccine adsorbed) in combination with an immunostimulatory oligodeoxynucleotide compound, CPG 7909, and is being evaluated in a Phase Ib trial.