According to an MPI summary, the inquiry began after the listeria outbreak was linked to the hospital kitchen in July 2012. The ESR was sent 62 unopened Bay Cuisine cold-meat packages and all were found to contain listeria.
In responses to DHB requests to Bay Cuisine for results of tests on its products, Mackie had said a batch of corned silver side tested negative for listeria, although it had actually tested "presumptive positive", and the company had omitted sending other reports showing that some other product also tested "presumptive positive".
The investigation also included text messages showing Wise suggested Mackie withhold the presumptive results, because there were only three or four of them, and said: " ... we just send the good."
In a statement yesterday, the company said while some products had tested positive, the results were at "a very low level," which in MPI guidelines were described as "marginal".
"The company did not knowingly sell any contaminated cooked meats," it said, but added that in pleading guilty it acknowledged that "with the benefit of hindsight" it could have acted "more appropriately in some of its communication with the ministry".
The company said it ceased production of sliced cooked meats in July 2012 and implemented procedural and management changes which included adopting a listeria management plan, although there was no statutory requirement to do so at the time.
The company said its cooked hams are released after confirmation of clear product tests.