I hope you feel better quickly! This has been a bad year for cold/flu. I just saw a note on the news comparing it to 2008 (iirc) and 2014 for severity. I myself haven't been 100% since something like September, when I lost my voice. Since then the sniffles or chest congestion keeps low-key coming back. (Bleh!) But, I know I'm not taking the care of myself that I should, and I'm under a lot of yucky stress.

So I'm wishing you a cozy and comfortable recuperation and return to feeling yourself again. What is your go-to comfort "thing" when you're sick? For me it's hot chamomile tea and snuggling into a sofa with the sun coming through a window.

As I commented above, I think the short time from opening the package to symptoms showing may indicate that the package isn't the source. But since cold & flu type virus can hang out for a long time before taking hold, I would guess that it could have come in on anything, such as recently purchased sundries.