Here are the references: 1. Swedish study about memory T-cells and long-term immune protection against COVID-19 https://www.biorxiv.org/content/10.11... Full paper: https://www.cell.com/action/showPdf?p... 2. Paper about memory T-cell activity against covid-19. T cells from blood specimens obtained in the US between 2015 and 2018 https://pubmed.ncbi.nlm.nih.gov/32473... 3. Similar findings in Germany (https://www.nature.com/articles/s4158...) and Singapore (https://pubmed.ncbi.nlm.nih.gov/32668...) 4. Antibodies in New York (23% of the population) https://pubmed.ncbi.nlm.nih.gov/32648... 5. Antibodies in London (18% of the population) https://www.gov.uk/government/publica... 6. Map that shows how the number of tests was changing each day from January to October. https://ourworldindata.org/grapher/da... 7. Confirmed covid-19 cases from January to October for each day for each country https://ourworldindata.org/coronaviru... https://www.worldometers.info/coronav... 8. Number of deaths https://www.worldometers.info/coronav... DATA: https://off-guardian.org/2020/06/27/c... https://bpa-pathology.com/covid19-pcr... https://www.cell.com/action/showPdf?p... https://www.nature.com/articles/s4158... https://pubmed.ncbi.nlm.nih.gov/32668...