Husband of my best friend was hospitalized in Dec 2019 w horrid respiratory issues. (Manhattan KS, next door to Ft. Riley army base.) We didn't yet know about covid although it was here, as you stated, in October due to those military games. My friend's husband was on IV antibiotics, pain killers, steroids and oxygen (not ventilator--hadn't heard of covid yet). Nothing was helping. I took him a lot of Liposomal Vit C (in packets from LivOn Labs--amazing product) and that was what began to turn it around. By the time we got into covid awareness-March 2020, we realized that's what he had but was pretty much over it by then although still using oxygen some at home.