Farms were the first link in the production chain because what they produced was collected and processed under strict sanitary standards.
"If there is any break in this pasture to plate chain then product does not go, or rather, that is how things are meant to work,'' Mr Leferink said.
Sources have called for heads to roll at Fonterra over the scare, but Mr Leferink said now was not the time to think about that.
"We are here because of that single unsanitary pipe at Fonterra's Hautapu factory. There will be a reckoning but now is not the time; the 'who, what, why, when, where and how' questions come later. Right now we owe it to our consumers here and abroad to give them facts and not speculation. We owe it to them to communicate truthfully and in a format they will understand.''
Mr Leferink said the most important think now was for communication channels to be kept open between the Ministry for Primary Industries as the regulator, Fonterra as the processor and the companies who used potentially contaminated product.
"Our only priority must be food safety and the integrity of what we export. Integrity is communicating facts openly and transparently and this is thankfully happening.''