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Rotarix

Generic name: rotavirus vaccine, live attenuated
Treatment for: Prevention of Rotavirus Gastroenteritis

Update: Rotarix Now FDA Approved - April 3, 2008

GSK Receives Favorable Recommendation by FDA Advisory Committee for Rotarix (Rotavirus Vaccine, Live, Oral)

GAITHERSBURG, Md. and PHILADELPHIA, February 20, 2008 /PRNewswire-FirstCall/ -- GlaxoSmithKline announced today that the U.S. Food and Drug Administration's (FDA) Vaccines and Related Biological Products Advisory Committee (VRBPAC) provided a favorable recommendation for the Company's oral rotavirus candidate vaccine, Rotarix [rotavirus vaccine, live, oral], to prevent rotavirus gastroenteritis in infants. The Committee voted unanimously (12-0) in favor of GSK's data being adequate to support the efficacy of the candidate vaccine. The Committee voted 11-1 in favor of GSK's data being adequate to support the safety of the candidate vaccine.

If approved by the FDA, GSK's candidate vaccine would allow for completion of the rotavirus vaccination series by four months of age and could be integrated into the current vaccine schedule at the two and four month immunization visits. Severe rotavirus diarrhea and dehydration can occur as young as three months of age. Of children under five years of age in the U.S. hospitalized with rotavirus, approximately one in five are younger than six months of age. Rotavirus infects virtually every child in the U.S. by age five and is the leading cause of severe gastroenteritis in infants and young children worldwide.

The candidate vaccine contains a live, weakened form of human rotavirus derived from the most common human rotavirus strain. "If approved, we believe Rotarix, which was developed to mimic the protective effects of natural infection, would offer an important option in completing rotavirus vaccination by four months of age," said Barbara Howe, M.D., Vice President and Director, North American Vaccine Development, GlaxoSmithKline. "Studies have shown that naturally occurring human rotavirus infection provides significant protection against subsequent moderate to severe rotavirus gastroenteritis regardless of the infecting serotype."

The committee's favorable recommendation, although not binding, will be considered by the FDA in its review of the Biologics License Application (BLA) for the candidate vaccine, which is currently underway.

Clinical data published on two doses of Rotarix show that protection was sustained through the first two years of life and was highly efficacious against rotavirus hospitalizations (96%) and severe rotavirus gastroenteritis (90%). In addition, the candidate vaccine was effective against rotavirus gastroenteritis of any severity (79%). Specifically, significant protection was demonstrated against severe rotavirus gastroenteritis during two rotavirus seasons caused by types G1 (96%), G2 (86%), G3 (94%), G4 (95%), and G9 (85%), the most commonly circulating rotavirus types in the U.S.

The CDC Advisory Committee on Immunization Practices (ACIP), the American Academy of Pediatrics (AAP), and the American Academy of Family Physicians (AAFP) recommend that infants receive routine vaccination with the rotavirus vaccine currently licensed by the FDA at two, four, and six months of age in order to prevent rotavirus gastroenteritis.

About Rotarix

The GSK candidate rotavirus vaccine is an oral live-attenuated human rotavirus vaccine licensed in more than 100 countries around the world. The vaccine was developed to prevent rotavirus gastroenteritis by mimicking the protective effects of natural human rotavirus infection. Naturally occurring human rotavirus infection provides significant protection against subsequent moderate to severe rotavirus gastroenteritis regardless of the infecting serotype(s). Five phase III clinical trials were conducted worldwide to assess the safety and efficacy of GSK's rotavirus candidate vaccine in support of U.S. licensure. The BLA for the GSK rotavirus candidate vaccine is based on one of the largest clinical development plans undertaken by a vaccine manufacturer and includes data from nearly 75,000 infants. The clinical trials conducted in support of U.S. licensure demonstrated efficacy against rotavirus gastroenteritis of any severity due to the five most common currently circulating rotavirus types. The most common solicited adverse reactions in clinical trials were fussiness/irritability, cough/runny nose, fever, loss of appetite, and vomiting.

About Rotavirus

Rotavirus infects virtually every child worldwide by age five and is the leading cause of severe gastroenteritis in infants and young children in the U.S. and worldwide. Severe, dehydrating gastroenteritis can occur as young as three months of age. In the U.S. each year, 2.7 million children younger than five years of age suffer from rotavirus disease, resulting in 410,000 clinic visits and up to 272,000 emergency room visits. In addition, between 55,000 and 70,000 children are hospitalized and 20-60 die each year. In the U.S., the rotavirus season typically begins in the southwest during November- December and spreads to the northeast by April-May.

GlaxoSmithKline: A Leader in Vaccines

GlaxoSmithKline, with U.S. operations in Philadelphia, PA, and Research Triangle Park, NC, is one of the world's leading research-based pharmaceutical and healthcare companies and is committed to improving the quality of human life by enabling people to do more, feel better and live longer.

GSK Biologicals (GSK Bio), one of the world's leading vaccine manufacturers, is headquartered in Rixensart, Belgium, where the majority of GlaxoSmithKline's activities in the field of vaccine research, development and production are conducted.

GSK Bio employs more than 1,500 scientists, who are devoted to discovering new vaccines and developing more cost-effective and convenient combination products to prevent infections that cause serious medical problems worldwide. In 2006, GSK Bio distributed more than 1.1 billion doses of vaccines to 169 countries in both the developed and the developing world - an average of 3 million doses a day. Of those vaccine doses, approximately 136 million were doses of combination pediatric vaccines which protect the world's children from up to six diseases in one vaccine.

Cautionary statement regarding forward-looking statements
Under the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995, the company cautions investors that any forward-looking statements or projections made by the company, including those made in this Announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Factors that may affect the Group's operations are described under 'Risk Factors' in the 'Business Review' in the company's Annual Report on Form 20-F for 2006.

CONTACT: Media, Jeff McLaughlin, +1-919-483-2839, or Alice Hunt, +44 208047 5502, or Investors, Frank Murdolo, +1-215-751-7002, or Tom Curry,+1-215-751-5419, all of GlaxoSmithKline

Ticker Symbol: (NYSE:GSK)

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Posted: February 2008

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