That had resulted in some exporters halting shipments to China as a precaution, but he described the impact as being minimal, Ainsworth said.
"We are confident that appropriate controls are in place to help prevent Covid-19 transmission at worksites. Premises have processes in place to manage the risk of export products being exposed to Covid-19, and, as a precaution, to suspend exports to meet market expectations."
MPI refused to tell RNZ the exact number of businesses affected, or the date when it had first been notified, stating the information was provided to the ministry in confidence.
It would continue to work with primary sector exporters to ensure market access expectations were met, Ainsworth said.
"New Zealand has strong national Covid-19 controls in place and a great track record of managing the disease. New Zealand food manufacturers and exporters have responded well to managing the risk of Covid-19 transmission and want to continue to keep their workers safe, and their exports flowing."
The scientific literature and experience of global public health authorities was that transmission by airborne droplets and aerosols was the dominant pathway for Covid-19 infection and that it was highly unlikely the virus could spread by food or food packaging, Ainsworth said.
- RNZ