I wrote it that way because, while the last egg was refrigerated and not powdered, it was still fairly old. The last supply plane they got was around April, I think.
It's plausible that when you have to drink a gallon of that stuff, you belt it back in a hurry and wouldn't notice a bug fell in your drink. It's also plausible in this day and age that someone at the clinic slipped it in for the pic and the lulz.