The term "diseased flesh" sounds rather bad, but is it? Obviously, an egg or rabbit or monkey will only produce more virus and antibodies if it is exposed to the disease - therefore, it is 'diseased.' And then the "diseased flesh' is extracted, purified, denatured with solvents, and heat treated so that it contains proteins that cannot spread influenza, but which can provide immunity in people that take the vaccine. All in all, that sounds like a good thing - if one egg can protect thousands of people, or if one monkey can protect tens or hundreds of thousands of people, that is acceptable to me.