VENLO, The Netherlands and MELBOURNE, Australia, QIAGEN N.V. today announced that its acquisition of all the ordinary shares in Cellestis Limited (“Cellestis”) by a way of a scheme of arrangement (“Scheme”) has been implemented.

The closing of the transaction follows the official approval of Cellestis’ shareholders and Australian courts. QIAGEN had announced the initial proposal to acquire Cellestis on April 4, 2011. With closing of the transaction Cellestis will become a fully consolidated subsidiary of the QIAGEN group.

“We are pleased to have completed the transaction and will now initiate the integration process”, commented Peer M. Schatz, Chief Executive Officer of QIAGEN N.V. “We welcome our new employees to QIAGEN and look forward to further growing the QuantiFERON® technology together to provide greater benefits to patients and healthcare providers, thereby creating significant value for QIAGEN shareholders.”

Cellestis has developed and successfully commercialized the QuantiFERON® technology, a proprietary approach for early disease detection not possible with other diagnostic methods. Cellestis’ QuantiFERON®-TB Gold (QFT) is a leading test for detection of latent tuberculosis. The QuantiFERON®-CMV test, which is in early stages of commercialization, enables monitoring of disease risk from the life-threatening cytomegalovirus (CMV).* QuantiFERON® is highly complementary to QIAGEN’s portfolio of molecular diagnostics and can help drive the use of traditional DNA- and RNA-based molecular diagnostics.

*QuantiFERON®-CMV is IVD CE marked for clinical use in the European Union and is a Research Use Only Product in the United States.

About QIAGEN

QIAGEN N.V., a Netherlands holding company, is the leading global provider of sample and assay technologies. Sample technologies are used to isolate and process DNA, RNA and proteins from biological samples such as blood or tissue. Assay technologies are used to make such isolated bio-molecules visible. QIAGEN has developed and markets more than 500 sample and assay products as well as automated solutions for such consumables. The company provides its products to molecular diagnostics laboratories, academic researchers, pharmaceutical and biotechnology companies, and applied testing customers for purposes such as forensics, animal or food testing and pharmaceutical process control. QIAGEN’s assay technologies include one of the broadest panels of molecular diagnostic tests available worldwide. This panel includes the digene HPV Test, which is regarded as a “gold standard” in testing for high-risk types of human papillomavirus (HPV), the primary cause of cervical cancer, as well as a broad suite of solutions for infectious disease testing and companion diagnostics. QIAGEN employs nearly 3,600 people in over 35 locations worldwide. Further information about QIAGEN can be found at http://www.qiagen.com/.