Emergent BioSolutions Anticipates 2nd Quarter BioThrax Revenues of Approximately $20 Million Based on Accelerated Delivery to Department of Defense.

Company Preparing Response to DoD Request for Proposal for Delivery of Up to 14 Million Additional Doses of BioThrax

ROCKVILLE, Md. — Emergent BioSolutions Inc. (NYSE:EBS), a biopharmaceutical company, announced today that, pursuant to the terms of an amended contract with the U.S. Department of Defense (DoD), it anticipates completing delivery of 900,000 doses of BioThrax([R]) (Anthrax Vaccine Adsorbed) during the quarter ending June 30, 2007 or shortly thereafter. The company anticipates that, with these deliveries, second quarter revenues would be approximately $20 million. The terms of the amended contract with the DoD authorize delivery of BioThrax ahead of schedule.

The company is also preparing its response to a May 7, 2007 request for proposal from the DoD for a follow-on contract for the supply of up to 14 million doses of BioThrax to the military for its active immunization program. The request for proposal contemplates a contract term of one base year and three option years.

“Emergent BioSolutions and the DoD have a longstanding relationship and we are pleased to continue to provide doses of BioThrax for the military’s ongoing active immunization program,” said Fuad El-Hibri, chairman and chief executive officer of Emergent BioSolutions. “By repeatedly fulfilling our commitments to the U.S. Government, we continue to strengthen our reputation for reliability–an essential element of a successful partnership with the government. I am proud of our role in helping to protect our nation’s troops against biological threats.”