Company Known for AQUAFLOR® (florfenicol) and AQUAVAC™ Vaccines in U.S. Aquaculture

SUMMIT, New Jersey, July 20, 2011 - Merck's (NYSE: MRK) animal health division, formerly known as Intervet/Schering-Plough Animal Health, announced that it has adopted the name of its parent company and will now be called Merck Animal Health.

"The name change reflects Merck's commitment to animal health and its complementary role to the overall business",

"We are unwavering in our commitment to veterinarians, producers, pet owners and society as a whole. We aim to generate additional value and sustained growth by continuing to provide integrated solutions with innovative animal health products and services to meet the evolving needs of our customers."

Merck Animal Health will continue to handle product development, marketing, sales, technical support and manufacturing for its extensive portfolio of animal health products, including the aquatic antimicrobial, AQUAFLOR® (florfenicol) Type A Medicated Article, and the vaccines, AQUAVAC-ESC® and AQUAVAC-COL®.

Merck Animal Health is a global leader in the research, development, manufacturing and sale of veterinary medicines and vaccines, with a strong presence in biologics and pharmaceuticals. The division generated global sales of $2.9 billion in 2010.

Merck values the diversification that Merck Animal Health brings to its portfolio, and sees growth opportunities in the business that can be leveraged across both animal and human health. The company intends to capitalize on Merck Animal Health's broad and innovative portfolio going forward, and to develop the unit into a best-in-class global animal health leader.

The name change follows the joint announcement on March 22, 2011 by Merck and sanofi-aventis that ended plans to form a new animal health joint venture. Both companies mutually decided to discontinue their agreement primarily because of the increasing complexity of implementing the proposed transaction.

Merck Animal Health will be known as MSD Animal Health outside the United States and Canada.

For more information, go to www.merck-animal-health.com or www.aquaflor-usa.com.

About Merck Animal Health
Today's Merck is a global healthcare leader working to help the world be well. Merck Animal Health, known as MSD Animal Health outside the United States and Canada, is the global animal health business unit of Merck. Merck Animal Health offers veterinarians, farmers, pet owners and governments the widest range of veterinary pharmaceuticals, vaccines and health management solutions and services. Merck Animal Health is dedicated to preserving and improving the health, well-being and performance of animals. It invests extensively in dynamic and comprehensive R&D resources and a modern, global supply chain. Merck Animal Health is present in more than 50 countries, while its products are available in some 150 markets. For more information, visit www.merck-animal-health.com.

Legal Notes
AQUAFLOR®, AQUAVAC™, AQUAFLOR-COL® and AQUAVAC-ESC® are trademarks owned by Intervet International B.V. or affiliated companies or licensors and are protected by copyrights, trademark and other intellectual property laws. This press release contains information on veterinary products based on international registration dossiers and may refer to products that are either not available in your country or are marketed under a different trade name. In addition, the approved indications as well as safety and efficacy data for a specific product may be different depending on local regulations and approvals. For more information, read the product labeling that applies to your country or contact your local Merck Animal Health representative.

Media Contacts
Sharon Dilling (+1 908 473 3390)
Joseph Feeks (+1 508 627 6949)

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