Dr. Rosengren might add a couple of things, but I think there are a couple of points here.
It isn't just the environment we're in, and that's a key part, but it's also the regulatory environment and what is approved. There are vaccines that are approved in some countries that are not allowed in others.
You're probably aware that in a lot of agriculture we have issues in terms of approving what I'll call “antibiotic alternatives” in this country, because the manufacturers don't see a big enough market for us in the animal sector here in Canada and therefore they're not approved. We need the ability to use other alternatives that other jurisdictions might have.