Tracking SARS-CoV-2 infection (IMAGE) Texas Biomedical Research Institute Caption The new reporter viruses help researchers observe the progression of SARS-CoV-2 infection in transgenic mouse models. Numbers indicate days post infection, and red indicates a larger amount of virus replication. Here, the amount of viral load reported in the lungs increases on day 2 post infection, and then drops off again on day 6 post infection. Credit Texas Biomed Usage Restrictions Image may be used with caption and 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.