Quidel today completes its $6 billion acquisition of Ortho Clinical Diagnostics Holdings, one of the world's largest in vitro diagnostics companies, which develops blood tests. Ortho shareholders will receive $7.14 and 0.1055 shares of Quidel stock for each of their shares and will own 38% of the combined company, which will be called QuidelOrtho, and its shares will trade on Nasdaq under the ticker symbol QDEL.