The booming business of the flu By: CNBC.com News October 19, 2015 at 10:13 AM EDT The market for influenza vaccines globally is estimated to be about $4 billion, and growing. Read More >> Related Stocks: Astrazeneca Plc ADR CVS Health Corp Carlisle Companies Inc Gsk Plc ADR Novartis Ag ADR Sanofi-Aventis S.A. ADR