Covid reinfection in a 25 year-old man in Nevada, as confirmed by virus genomic sequencing; 2nd infection more severe @TheLancetInfDis
https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30764-7/fulltext

This is the 1st USA documented reinfection
Conclusion: "All individuals, whether previously diagnosed with COVID-19 or not, should take identical precautions to avoid infection w/ #SARSCoV2."
Several more global cases are in process of peer review now. Appears rare, but possible

This★ insightful commentary by @VirusesImmunity on the new reinfection case and the other 3 previously published pulls it all together, along with the known unknowns (a lot of those)
https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30783-0/fulltext @TheLancetInfDis

Key point to add from @florian_krammer https://twitter.com/florian_krammer/status/1315792239768023042