Salmonella test close-up (IMAGE) McMaster University Caption McMaster University's new Salmonella test indicates the presence of Salmonella by producing a red dot on test paper. Credit Matthew Clarke, McMaster University Usage Restrictions None License Original content 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.