The results of further laboratory checks which could definitively rule Northern Ireland out as the source of the Foot and Mouth outbreak.
The results are expected tomorrow.
Ulster Farmers Union representative John Gilliland warned against over-confidence until blood test results are returned.
"We are all hanging our hats on this to find out what’s going on," he said.
Mr Gilliland urged farmers against panicking while the wait continues.
He said: "Don’t unnecessarily move stock around just in case we find that there’s a problem in Northern Ireland".