A Japanese case of VEXAS syndrome after COVID-19 vaccination: Comparison with previously reported cases

VEXAS (vacuoles, E1 enzyme, X-linked, autoinflammatory, and somatic) syndrome is a novel adult-onset autoinflammatory disorder caused by variants in the UBA1 gene. Here, we report a Japanese case of VEXAS syndrome in which symptoms began 1 day after the second booster dose of a coronavirus disease 2019 (COVID-19) messenger ribonucleic acid vaccine, and a UBA1 variant was subsequently confirmed. Combined with the three cases reported thus far, this suggests that the COVID-19 vaccine may be one of the triggers for development of VEXAS syndrome in Asian populations. Since COVID-19 vaccines have been reported to be associated with various autoinflammatory and autoimmune diseases, it is important to continue to pay close attention to the relationship between COVID-19 vaccines and VEXAS syndrome.