The answer seems to be :shrug: which is what I would think the answer would be right now. From the middle of the article: "Should reinfection prove commonplac

The answer seems to be :shrug: which is what I would think the answer would be right now. From the middle of the article: "Should reinfection prove commonplace, and barring a highly effective vaccine delivered to most of the world’s population, SARS-CoV-2 will likely become endemic" And the closing sentence: "A duration of immunity similar to that of the other betacoronaviruses (~40 weeks) could lead to yearly outbreaks of SARS-CoV-2, whereas a longer immunity profile, coupled with a small degree of protective cross-immunity from other betacoronaviruses, could lead to apparent elimination of the virus followed by resurgence after a few years. Other scenarios are, of course, possible, because there are many processes at play and much that remains unresolved."