Officials are working to determine whether they were exposed to a new batch of Novichok or whether they stumbled onto the same materials used to poison the Skripals.
A tent was erected outside the house, as-well as at least five outside the John Baker House homeless shelter in Salisbury, where Sturgess sometimes stayed.
British newspapers reported that samples were taken to the nearby United Kingdom military research center at Porton Down, the same facility that helped identify the nerve agent in the Skripal case.
On Thursday, Britain's Security Minister Ben Wallace called on Russian Federation to give details about the nerve agent attack on the Skripals.
"There is no evidence that either the man or woman recently visited any of the sites that were decontaminated following the attempted murders of Sergei and Yulia Skripal", Basu said in the statement.
Russia's ambassador to Britain, Alexander Yakovenko, has identified the alleged poison as Novichok A-234, derived from an earlier version known as A-232.
We have been talking to friends who were with the couple that day and have been providing police with details.More news: EU Parliament rejects opening copyright law update negotiations
"It is completely unacceptable for our people to be either deliberate or accidental targets, or for our streets, our parks and towns to be dumping grounds for poison", he told parliament.
Paramedics were called on Saturday morning to a house in Amesbury, a few miles from Salisbury, after the woman, named by media as Dawn Sturgess, collapsed.
At 6.20pm South West Ambulance Service are called back to the address on Muggleton Road and Mr Rowley is also taken to hospital.
'Meticulous and systematic searches are under way at a number of sites'.
Two people are in critical condition after coming into contact with the toxin.
"As before, my advice is to wash your clothes and wipe down any personal items, shoes, and bags, with cleansing or baby wipes before disposing of them in the usual way", she said. British ministers and members of the royal family have also boycotted the World Cup in Russian Federation.
The pair, who are being treated at Salisbury District Hospital, were initially believed to have taken heroin or crack cocaine from a contaminated batch but tests are ongoing to identify the substance involved.More news: Lions eat 'rhino poachers' on South African game reserve
'Some sort of glass vessel would have been fine, ' he said, 'with a decent cap to it that would have been safe for someone to carry, but they would also probably have it in some other leak-proof container - because, obviously, what you are trying to avoid at all costs is any sort of contact with it'.
Mr Javid called on Russian Federation to explain "exactly what has gone on", adding: "We will stand up to the actions that threaten our security".
Yulia spent more than a month in hospital before being discharged, while Sergei spent more than two months.
An emergency cabinet meeting, chaired by Home Secretary Sajid Javid, will be held in London on Thursday as the counter-terrorism police continue to probe the incident.
The risk to the public remained low, chief medical officer for England Sally Davies said, but issued "highly precautionary" advice to those with concerns.
The episode in Salisbury - the first use of a nerve agent in Europe since the Second World War - sparked worldwide outrage.More news: USA economy adds more jobs than expected in June