Health authorities in Canberra say the meal which contained death cap mushrooms that killed two people was prepared in a commercial kitchen.

The ACT Health Directorate says the food was for a private meal and no food containing the poisonous mushrooms was given to any member of the public.

A 52-year-old woman died and a 38-year-old woman died in hospital in Sydney yesterday after eating the meal.

A 51-year-old man remains in a critical but stable condition.