barcoded viruses (IMAGE) Texas Biomedical Research Institute Caption Using barcoded viruses, the researchers were able to identify which tissues SIV, the nonhuman primate equivalent of HIV, had replicated the fastest and spread the furthest, showing up in trace amounts in blood (center), just seven days after stopping antiretroviral treatment. The largest contributors were mesenteric lymph nodes (MesLN), inguinal lymph nodes (IngLN) and Spleen. Colors correspond to different animals. Credit Texas Biomed Usage Restrictions may reuse with credit 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.