Lorna Wilkinson, director of nursing at the hospital, said: "While this is welcome news, we are not out of the woods yet".
The nerve agent was produced in the Soviet Union during the Cold War.
The police officer leading the investigation into the latest Novichok poisoning in the United Kingdom has said he does not know if it will ever be possible to establish a definitive link between the most recent poisoning and that of Sergei and Yulia Skripal last March. Public Health England have repeatedly said there is no wider threat to the public arising from the Skripal case. Metropolitan Police Assistant Police Commissioner Neil Basu told residents of Amesbury Tuesday night that police are searching for the container that held the nerve agent believed to have poisoned two people on June 30.
The British government has accused Russian Federation of being behind the attack on Mr Skripal, who settled in the United Kingdom after a spy swap.
A British man poisoned with the Novichok nerve agent 10 days ago has regained consciousness and is now in a critical but stable condition, Salisbury District Hospital said on Tuesday.
All The Royal Fashion From Prince Louis' Christening
It was the first time the Duke and Duchess of Cambridge and their three children have been seen together as a family of five. Time goes by so quickly, and the little princess , now three, looks more and more like her mom the more time that passes.
The mother of three sadly died on Sunday, but Mr Rowley's condition has improved, leading to hopes that he could make a full recovery.
Describing the difficulties of the investigation, Metropolitan Police Assistant Commissioner Neil Basu said: 'There are multiple scenes, there are only limited numbers of scientists and forensic medical officers - all of whom are volunteers by the way - to do what is a really, really risky piece of work for obvious reasons.
Central to the investigation are John Baker House, the supported-living accommodation where Ms Sturgess lived, Mr Rowley's home in Amesbury, and Salisbury's Queen Elizabeth Gardens, which remains cordoned off. Britain has accused the Russian state of the attack on the Skripals, a charge denied by the Kremlin. Peskov added that such attacks present a danger not only inside the United Kingdom, but also in Europe as a whole.
Asked whether the death could cloud the upcoming US-Russia summit in Helsinki next week, Peskov replied that the poisoning "has no relation" to the meeting.
Moscow said London has declined its offers for a joint investigation into the poisonings.