New TB Test (image) University of California - Davis Share Print E-Mail Caption This microfluidic chip invented at UC Davis uses DNA, coated on the gold spots, to test for gamma interferon -- a test for latent TB infection. The test promises to be cheaper and faster than existing tests. Credit Ying Liu, UC Davis Usage Restrictions May be used with credit to the source. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.