Creed Creed MA MA Ballesteros Ballesteros E E Greenfield Greenfield LJ LJ Jr Jr Mild COVID-19 infection despite chronic B cell depletion in a patient with aquaporin-4-positive neuromyelitis optica spectrum disorder Mild COVID-19 infection despite chronic B cell depletion in a patient with aquaporin-4-positive neuromyelitis optica spectrum disorder Mult Scler Relat Disord Mult Scler Relat Disord 2020 2020 44 44 102199 102199 supplied-pmid 32554285? This evidence concerns the gene AQP4 and neuromyelitis optica.