The immune response to COVID-19 - caused by the coronavirus SARS-CoV-2 - is not yet fully understood.
Patients with MERS-CoV (a different coronavirus) infection are unlikely to be re-infected shortly after they recover, but it is not yet known whether similar immune protection will be observed for patients with COVID-19.
Researchers do believe there have been a few cases of reinfection with SARS-CoV-2. How frequently this may occur is still being determined; for a nice analysis of this issue, check out this article.
Drafted 14 September 2020