I have not researched this specific claim but I will tell you that Betadine has a spray with this ingredient but it isnt sold in the US
You can find it on Amazon for a big price. Dont know if they ship to US.
here is info on it
http://sg.betadine.com/en/sg/cold-and-flu/betadine-cold-defence-nasal-spray
I bet you can do almost as well by irrigating your nasal passages with a solution of hydrogen peroxide
No notes in these studies about the participants taking daily VitD3, Vit C, zinc and quercetin