Piper Jaffray analyst William Quirk notes that Qiagen (QGEN) announced a partnership with DiaSorin to develop an automated QuantiFERONTB test for the LIAISON analyzers, and argues that it could be disruptive to the existing physician office latent TB market. The analyst believes the agreement could put pressure on some of Oxford's (OXFD) business and potentially force the company to sign a similar deal with a different immunoassay provider. Quirk points out that Oxford also announced preliminary Q4 revenue below the Street, and while the company did not explain the weak results, he believes it was from U.S. immigration weakness and China order timing.