Vitamin A, C, D, E: Potentially beneficial for SARS-CoV-2 ventilator patients?

""If you're deficient in vitamin D, that does have an impact on your susceptibility to infection,” said Dr. Fauci, director of the National Institute of Allergy and Infectious Diseases. “I would not mind recommending, and I do it myself, taking vitamin D supplements.” But that's not all: Dr. Fauci also recommended another vitamin. “The other vitamin that people take is vitamin C because it's a good antioxidant, so if people want to take a gram or so of vitamin C, that would be fine,” he said."
https://www.health.com/nutrition/vitamins-supplements/dr-fauci-vitamin-c-and-d