There are several diseases that can be carried within the egg. MG and MS to name 2. I believe it is a reportable disease in the USA but not in Canada for chickens (it is for turkeys) MG is a serious threat to commercial egg producers.
No no you didn't scare anyone off! My daughter got her horse semen through no problem, ( she's shouting at the border guard, "do you know how time sensitive this stuff is!!") but truly we've never tried to bring any contraband through otherwise. Although I'm so tempted with Baldwin apple trees. Nother story.