Dr. Glynn also confirmed that there have now been 865 cases of Covid-19 diagnosed among meat plant staff - an increase of 37 on the same figure last week - while the number of Covid-19 "clusters" at meat plants remains at 16.
Dr Tony Holohan, Chief Medical Officer, Department of Health, said: "Today NPHET recommended that the HSE build on the very significant work to date in expanding the testing capacity, to ensure that there is an integrated and coordinated clinical and public health-informed approach to the establishment and implementation of a national testing strategy".
472 deaths reported by the Department of Health for the same period, making it possible the number of deaths due to Covid-19 in the North being nearly 30% higher than the official figures indicate.
The latest figures from Nisra also include a breakdown of all Covid-19 related deaths by council area.
The total number of all deaths registered in Northern Ireland in the week ending 15 May was 396; rising from 336 in the previous week - and higher than what would be expected at this time of year.