My point was more that your 4 cents per egg was (apparently) wrong by a factor of ~90.

Do you have reason to doubt the $0.14 per hen quoted in the article? I'm interpreting the $0.14 as the incremental cost of vaccinating the birds, is that the wrong interpretation? Is the article flat out wrong?

Ops, yea. I was thinking about there estimate of the cost of changing the regulation was high not the exponent.