Quidel Corp. reported a definitive agreement to acquire Ortho Clinical Diagnostics Holdings plc in a nearly $6 billion deal expected to close in the first half of 2022. The $24.68 per share offered by Quidel represents a nearly 25% premium over Ortho’s closing price as of Dec. 22. Quidel will also assume $2 billion in debt. In addition, Laboratory Corp. of America Holdings (Labcorp) said it would acquire Baltimore-based Personal Genome Diagnostics Inc., which offers a portfolio of genomics-based liquid biopsy and tissue-based diagnostic products, for $450 million in cash at closing plus up to $125 million contingent on achieving specific performance milestones. That deal is also expected to close in the first half of 2022, pending approval by both companies’ shareholders.