Vitamin C is a powerfull antiviral at correct dosages and one of the best free radical scavengers! So unequivically. I would say yes, very much so!
Free radical scavengers can be exhausted systemically by free radicals resulting from exposure to chemicals such as formaldehyde, chronic infections such as Epstein-Barr viral infections, other allergic reactions, injury, emotional stress, etc. resulting in priming of antibodies systemically. The more antibodies primed systemically, the more likely cross reactions will occur with self-molecules and I think that ascorbate, at the dose levels being discussed, manages to reduce the interchain SS bonds of antibodies except directly down on the tissues directly infected where the free radicals and oxidants are intensely concentrated. In the depths of infection, ascorbate assists the phagocytes maintain the respiratory burst killing of pathogens while protecting adjacent tissues from stray free radical damage (5). autoimmune reactions occur.