AT1 FY21 - General Discussion + FA, page-812

the name is derived from the purpose of the test -

"C-reactive protein (CRP) and myxovirus resistance protein A (MxA) are associated with bacterial and viral infections, respectively. We conducted a prospective, multi-center, cross-sectional study of adults and children with febrile upper respiratory tract infections (URIs) to evaluate the diagnostic accuracy of a rapid CRP/MxA immunoassay to identify clinically significant bacterial infection with host response and acute pathogenic viral infection."

"Febri" + "Dx" (aka diagnostics) = FebriDx