Dutch biotechnology company Crucell N.V. (Euronext, NASDAQ: CRXL, Swiss Exchange: CRX), the Aeras Global TB Vaccine Foundation and the South African Tuberculosis Vaccine Initiative (SATVI) at the University of Cape Town today announced the launch of a new Phase I clinical trial of the unique AdVac®-based tuberculosis vaccine, six months after launching a similar study in the US. The trial will be conducted in the Boland-Overberg region of Western Cape Province in South Africa, which has one of the world's highest TB burdens.

"We are very proud that Crucell's technologies are playing a key role in the search and development of a much-needed TB vaccine," said Dr. Jaap Goudsmit, Chief Scientific Officer at Crucell. "We also feel honored to collaborate with Aeras and SATVI on this important mission."

Aeras and Crucell began jointly developing this vaccine candidate, called AERAS-402, in 2004 using Crucell's AdVac® vaccine technology and PER.C6® manufacturing technology. A Phase I clinical trial launched in October 2006 in the United States indicates that the vaccine candidate is safe in healthy adults in the US. The main parameters under examination in the current study will be safety, tolerability and immunogenicity of AERAS-402 in healthy adults in South Africa.

"The world desperately needs a new TB vaccine, and this clinical trial, in a region severely impacted by TB, is an important step in Aeras' mission to develop these crucial vaccines," said Dr. Jerald C. Sadoff, President and CEO of Aeras. "Aeras is delighted to be working with the excellent researchers at Crucell and SATVI. We are grateful to the Bill and Melinda Gates Foundation and the Dutch Ministry of Foreign Affairs for their financial support of this trial and our vaccine development efforts."

The trial will be conducted as a double-blind, randomized, placebo-controlled dose escalation study in three groups of healthy adults previously vaccinated with Bacille Calmette-Guérin (BCG). A total of 30 healthy adult volunteers will be enrolled.

"We are pleased to be playing such an important role in the global effort to develop new vaccines against TB," said Dr. Gregory Hussey, Principal Investigator for the trial. "In the process of conducting this trial, we are advancing the development of a new TB vaccine, expanding scientific capacity, and building awareness of the need for new TB vaccines."

About tuberculosis
Tuberculosis is the world's second deadliest infectious disease, with 8 to 9 million new cases diagnosed each year. According to the World Health Organization (WHO), an estimated 1.6 million people died from TB in 2005. One third of the world's population has been infected with the TB bacillus and current treatment takes 6-9 months. The current TB vaccine Bacillus Calmette-Guérin (BCG), developed over 85 years ago, reduces the risk of severe forms of TB in early childhood, but is not very effective in preventing pulmonary TB in adolescents and adults - the populations with the highest rates of TB. TB is changing and evolving, making new vaccines more crucial to controlling the pandemic. Tuberculosis is now the leading cause of death for people with AIDS, particularly in Africa. Multi-drug resistant TB (MDR-TB) and extremely drug-resistant TB (XDR-TB) are hampering treatment and control efforts.

About AdVac® technology and Ad35
AdVac® technology is a vaccine technology developed by Crucell and is considered to play an important role in the fight against emerging and re-emerging infectious diseases, and in biodefense. The technology supports the practice of inserting genetic material from the disease-causing virus or parasite into a 'vehicle' called a vector, which then delivers the immunogenic material directly to the immune system. Most vectors are based on an adenovirus, such as the virus that causes the common cold. The AdVac® technology is specifically designed to manage the problem of pre-existing immunity in humans against the most commonly used recombinant vaccine vector, adenovirus serotype 5 (Ad5), without compromising large-scale production capabilities or the immunogenic properties of Ad5. AdVac® technology is based on adenovirus vectors that do not regularly occur in the human population, such as Ad35. In contrast to the AdVac® vectors, antibodies to Ad5 are widespread among people of all ages and are known to lower the immune response to Ad5-based vaccines, thereby impairing the efficacy of these vaccines. All vaccine candidates based on AdVac® are produced using Crucell's PER.C6® production technology.

About PER.C6® technology
Crucell's PER.C6® technology is a cell line developed for the large-scale manufacture of biopharmaceutical products including vaccines. The production scale potential of the PER.C6® cell line has been demonstrated in an unprecedented successful bioreactor run of 20,000 liters. Compared to conventional production technologies, the strengths of the PER.C6® technology lie in its excellent safety profile, scalability and productivity under serum-free culture conditions. These characteristics, combined with its ability to support the growth of both human and animal viruses, make PER.C6® technology the biopharmaceutical production technology of choice for Crucell's current and potential pharmaceutical and biotechnology partners.

About Aeras
The Aeras Global TB Vaccine Foundation (www.aeras.org) is a non-profit organization working as a Product Development Partnership to develop new tuberculosis vaccines and ensure that they are distributed to all who need them around the world. Dr. Jerald C. Sadoff, President and CEO of Aeras, has worked in vaccine development for more than 30 years. He led efforts to develop and obtain licensure for nine currently licensed vaccines and has been involved in the research and development of numerous other vaccines. Aeras is primarily funded by the Bill and Melinda Gates Foundation, and also receives important support from the Dutch Ministry of Foreign Affairs, the Danish International Development Agency, and the U.S. Centers for Disease Control and Prevention. Aeras is based in Rockville, Maryland, where it recently opened a state-of-the-art manufacturing and laboratory facility.