Quest Diagnostics, Inc. has agreed to acquire Focus Diagnostics, Inc., an infectious disease testing provider, for approximately $185 million in cash. Focus Diagnostics is based in Herndon, VA. The acquisition will add annual revenues of approximately $65 million. Focus Diagnostics is a portfolio company of private equity firms DLJ Merchant Banking and The Sprout Group. Excluded from the transaction is Focus Bio-Inova, Focus Diagnostics’ pharmaceutical testing operation. The transacti...