[Closed] Yikes! I puked on a ride...

ok, no other to way to put this nicely, about 10 hours into an outing on the SDW I barfed and my riding partner barfed later that night. This was followed by shivers and what felt like a serious hangover. We ate, drank and rested every 25k and didn't push the pace at all. And it wasn't that hot (didn't ride yesterday). I have been doing long day rides on and off for 10 years and rode the same route on the SDW just a few weeks before with no effects, anyone any idea what could cause this?
We didn't share food or water. Very bizarre very unpleasant.