Sanofi Pasteur s A(H1N1) Vaccine HUMENZA * Recommended by European Medicines Agency Lyon, France

Sanofi Pasteur s A(H1N1) Vaccine

by European Medicines Agency

Lyon, France - February 19, 2010 - Sanofi Pasteur, the vaccines division of sanofi-aventis Group (EURONEXT: SAN and NYSE: SNY), announced

today that its adjuvanted A(H1N1) monovalent influenza vaccine, Humenza , has received a positive opinion from

Europe s Committee for Medicinal Products for Human Use (CHMP), the scientific committee of the European Medicines Agency (EMA).

The CHMP is recommending the marketing authorization of Humenza vaccine in European Union countries for the

active immunization of persons 6 months of age and older against influenza disease caused by the pandemic A(H1N1) 2009 virus.

positive opinion granted today to Humenza vaccine through the European centralized marketing authorization application

process was based on a review of results from clinical trials on Sanofi Pasteur s A(H1N1) AF03-adjuvanted influenza vaccine candidate. These trials conducted in healthy children (6 months to 17 years of age), adults and the

elderly evaluated the safety of Humenza vaccine and its ability to elicit a sero-protective immune response to the

A(H1N1) pandemic strain now circulating.

Humenza vaccine s safety profile is satisfactory in all age-groups in the studies and similar to that of adjuvanted pandemic influenza vaccines already licensed. In all

age-groups children 6 months to 17 years of age, adults and the elderly immune response measurements showed that a single dose of Humenza influenza A(H1N1) monovalent vaccine induced a high antibody response 21 days post-vaccination that meets the three EMA immunological criteria and is considered

As the world leader in research, development and manufacturing of influenza vaccines, Sanofi Pasteur is committed to a three-pronged

public-health mission: to produce and deliver the southern hemisphere seasonal influenza vaccine, to produce the northern hemisphere seasonal influenza vaccine for later in 2010 and to work with the world s health authorities to safeguard human

health during the current pandemic and to prepare for any future threats. Sanofi Pasteur is working diligently on all fronts.

Sanofi Pasteur s adjuvanted A(H1N1) 2009 monovalent inactivated influenza vaccine, Humenza , is manufactured at Sanofi Pasteur s facility in Val de Reuil, France, using the same process as Sanofi Pasteur s seasonal trivalent influenza vaccine

Humenza vaccine contains 3.8 mcg hemagglutinin (HA) of influenza A/California/07/2009 (H1N1) like virus and includes Sanofi Pasteur s proprietary AF03-adjuvant,

designed to stimulate the immune system to increase an immunological response.

Humenza vaccine is not intended to be distributed in the U.S., where Sanofi Pasteur produces another A(H1N1) pandemic vaccine licensed by the United States

Food & Drug Administration.

About Influenza Vaccine Production at Sanofi Pasteur

Sanofi Pasteur operates influenza vaccine production facilities in Val de Reuil, France and in Swiftwater, Pa. (U.S.). All Sanofi Pasteur influenza vaccine facilities

have been designed to switch from seasonal influenza vaccine production to pandemic influenza vaccine production.

Sanofi Pasteur produces approximately

40 percent of the influenza vaccines distributed worldwide. For the 2008-2009 influenza season, the company produced more than 45 percent of the influenza vaccines distributed in the U.S. More information about Sanofi Pasteur s pandemic

preparedness efforts can be found at www.pandemic.influenza.com

About sanofi-aventis

Sanofi-aventis, a leading global pharmaceutical company, discovers, develops and distributes therapeutic solutions to improve the lives of everyone. Sanofi-aventis is

listed in Paris (EURONEXT: SAN) and in New York (NYSE: SNY). For more information, please visit: www.sanofi-aventis.com

vaccines division of sanofi-aventis Group, provided more than 1.6 billion doses of vaccine in 2008, making it possible to immunize more than 500 million people across the globe. A world leader in the vaccine industry, Sanofi Pasteur offers the

broadest range of vaccines protecting against 20 infectious diseases. The company s heritage, to create vaccines that protect life, dates back more than a century. Sanofi Pasteur is the largest company entirely dedicated to vaccines. Every

day, the company invests more than EUR 1 million in research and development. For more information, please visit: www.sanofipasteur.com or www.sanofipasteur.us

Forward Looking Statements

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Private Securities Litigation Reform Act of 1995, as amended. Forward-looking statements are statements that are not historical facts. These statements include product development, product potential projections and estimates and their underlying

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biological application that may be filed for any such product candidates as well as their decisions regarding labelling and other matters that could affect the availability or commercial potential of such products candidates, the absence of

guarantee that the products candidates if approved will be commercially successful, the future approval and commercial success of therapeutic alternatives as well as those discussed or identified in the public filings with the SEC and the AMF made

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