Sanofi Pasteur is the vaccines division of the multinational pharmaceutical company Sanofi. Sanofi Pasteur is the largest company in the world devoted entirely to vaccines. Sanofi Pasteur is one of four global producers of the yellow fever vaccine. In 2004, Aventis merged with and into Sanofi. The new Sanofi-Aventis Group became the worlds 3rd largest pharmaceutical company. Aventis Pasteur, the vaccine division of Sanofi-Aventis Group, changed its name to Sanofi Pasteur. In 2014, Sanofi Pasteur stopped producing its effective Fav-Afrique antivenom because competition from cheaper though less powerful competitors made it unprofitable. Doctors Without Borders said that it would take two years to develop a similar antivenom, and that existing stocks will run out in June 2016.