> I think it's most, but not all, chickens. Vaccination is part of the red lion quality brand mark Ahh, you're right. But I believe that all (or virtually all)

> I think it's most, but not all, chickens. Vaccination is part of the red lion quality brand mark Ahh, you're right. But I believe that all (or virtually all) eggs sold into the supermarket supply chain carry the red lion mark. The other 15% are presumably used by commercial customers where they are guaranteed to be pasteurised or cooked enough to prevent any onward contamination.