Even more good news and some bad news
https://www.bloomberg.com/opinion/articles/2020-05-21/if-i-had-covid-19-am-i-immune-what-scientists-know-so-far
To summarize:
1) Both animal and human studies show that the immune system has primary and auxiliary responses to the novel coronavirus. Background papers:
https://science.sciencemag.org/content/early/2020/05/19/science.abc4776 (Science)
https://doi.org/10.1016/j.cell.2020.05.015 (Cell)
2) Currently, antibody tests are not reliable enough to make individual and population-wide conclusions about immunity.
https://immunology.sciencemag.org/content/immunology/5/47/eabc6347.full.pdf (Science Immunology)
To summarize:
1) Both animal and human studies show that the immune system has primary and auxiliary responses to the novel coronavirus. Background papers:
https://science.sciencemag.org/content/early/2020/05/19/science.abc4776 (Science)
https://doi.org/10.1016/j.cell.2020.05.015 (Cell)
2) Currently, antibody tests are not reliable enough to make individual and population-wide conclusions about immunity.
https://immunology.sciencemag.org/content/immunology/5/47/eabc6347.full.pdf (Science Immunology)