ACT Health authorities are concerned for two people poisoned by death cap mushrooms in Canberra.

The poisonings have brought to four the number of suspected cases of people harvesting and eating wild mushrooms.

The latest poisoning is unrelated to the three cases that emerged at the weekend.

Two patients in Canberra are recovering well and are expected to be discharged soon.

A third remains in Sydney's Royal Prince Alfred Hospital receiving specialist care.

ACT chief health officer Paul Kelly says it is concerning that the poison has entered the liver of the latest patient, who is female.

She is also in a Sydney hospital receiving specialist care.

"They became ill after harvesting wild mushrooms in the ACT," Dr Kelly said.

"They were at first presented to Queanbeyan Hospital on the 28th of April and then transferred to Canberra Hospital later that evening.

"Last night, unfortunately because of a deterioration in their condition, they were sent to Sydney for further care."

No link to Woolworths, despite claims

Authorities said the mushrooms at the centre of the three poisoning cases reported at the weekend had been picked, and that there was no link to Woolworths, as claimed by the victims.

Dr Kelly is again urging Canberrans not to pick and eat wild mushrooms.

"Particularly this time of year, we know there's a lot of death cap mushrooms out there after recent rain in the ACT," he said.

Dr Kelly says health officials are looking at new ways to educate people about the risks of death caps.

He says they have been working closely with multicultural communities and universities to educate new Canberra residents.

"Having four [cases] in a week when you've only had 16 in about 15 years is obviously an unusually large number and is really very concerning for us," he said.

Health Minister Katy Gallagher says the Government will look at what more can be done to educate people.

"We review this every single time someone presents with mushroom poisoning to have a look at could we have done something more, how do we prevent it in the future," she said.

"We'll do that in relation to the incidents we've seen over the last few days."

Symptoms of poisoning generally appear between six and 24 hours after ingesting death cap mushrooms.

Two people died from death cap mushroom poisoning in Canberra in 2012.