GlaxoSmithKline plc. (UK)
Pfizer Inc. (US)
Merck & Co. Inc. (US)
and Sanofi Pasteur SA (France). Other prominent players in this market include CSL Limited (Australia)
Emergent BioSolutions Inc. (US)
Johnson & Johnson (US)
Serum Institute of India (India)
AstraZeneca (UK)
Bavarian Nordic (Denmark)
Mitsubishi Tanabe Pharma Corporation (Japan)
and Daiichi Sankyo Company
Limited (Japan).