> Once an animal is vaccinated, it will test positively for the disease.
I think that there are two reasons. One is, as Michael said, a vaccinated animal will test positive on the current H&M screens. The second is that an animal which is vaccinated while infected will continue to shed virus as a carrier. (This is, for obvious reasons, even worse than an openly infected animal).
The EU made vaccination illegal for reasons of trade. If a nation is H&M-free without vaccination, it can export meat and dairy to any other nation. If it is H&M free with vaccination, some restrictions on trade are present, and if a H&M outbreak occurs H&M-free nations will bar meat and dairy products outright.
Interesting that an ancient disease is making headlines. Perhaps research enthusiasm for Hoof & Mouth will heat up accordingly.
Marco
,--------------------------------------------------------------------------.
> | Civil liberties are always safe <
> Marco Anglesio | as long as their existence doesn't <
> mpa at the-wire.com | bother anyone. <
> http://www.the-wire.com/~mpa | --New York Times editorial, <
> | Jan 3, 1941 <
`--------------------------------------------------------------------------'