ten days and counting

We are pretty much exhausted from blowing our noses and coughing.  No fevers, no body aches, no chest pain.  Going on ten days of no change for me, three for John.  Is it a coincidence that we got sick 2 days after our immunizations? Or could we have picked up a virus from a shopping cart or door handle? Personally, I have gone through four boxes of Kleenex in ten days. Ugh and UCK.