Haven’t officially had it (refusing to get tested unless required by work), but earlier in the year I was under the weather with some of the symptoms. Could have been the regular flu but my advice is do what you might do for any flu-like illness.

Supplements and foods containing Vitamin C, D, and Zinc. Immune system boosters and helps the body bounce back faster.

Hydroxychloroquine (AND Zinc) would be great from Doc but probably unlikely to receive. Listen to what’s recommended for his situation.

Home remedies can include breathing treatments/moisturizer, inhalers if needed, Tylenol and classic flu treatments like lots of fluids, sleep, and healthy nutrition. Get bed rest but get some sunshine if it’s not too cold/uncomfortable to do so. Sunlight/UV light activates the body’s cholesterol to vitamin D conversion, which helps further assist immune response. Maybe just 2-3 times a day for 15 minutes, can even sit in a sunny spot through windows if going out is not feasible.

Also good to move around a bit, if he can. The more daily activities that can be performed the better, but if it becomes difficult to do so (after being capable initially) it’d be best to get admitted to a hospital. In any event keep an eye on it and keep the doc updated if it gets worse.

Tell your dad to stay positive and kick it to the curb! He’s got this!