35-year study hints that coronavirus immunity doesn't last long Live ScienceCoronavirus detected in lake water, researchers find. Experts say don't panic. Yahoo LifestyleSelective and cross-reactive SARS-CoV-2 T cell epitopes in unexposed humans Science MagazineThe role of T-cells in SARS-CoV-2 virus defense Medical XpressIs there light at the end of the Covid‐19 tunnel?