A Russian Embassy spokesman said: "It is regrettable that United Kingdom officials try to link a second poisoning with Russia without having produced any credible results of the investigation of the first one".
The UK government has held Russian Federation responsible for the poisoning of the Skripals, a claim that Russian Federation denies.
If remnants of the March attack are proven, it could raise wider concerns that health officials failed to eliminate exposure risks after an extensive cleanup.
The officer went to Great Western Hospital in Swindon, a town in Wiltshire county, on Saturday night to seek "medical advice in connection with the ongoing incident in Amesbury", also in Wiltshire. British Home Secretary Sajid Javid told Parliament that it is now time for Russian Federation to explain "exactly what has gone on".
The latest victims of the poison were named by their friend Sam Hobson, 29, as Charlie Rowley and Dawn Sturgess. They say each is in a critical condition.
"It is completely unacceptable for our people to be either deliberate or accidental targets", Javid told Parliament, adding that it was also unacceptable for British streets or parks to be "dumping grounds for poison".
"Instead of genuine co-operation, London is doing everything possible to muddy the waters, to confuse and frighten its own citizens".
"We urge British law enforcement not to get involved in dirty political games", foreign ministry spokesperson Maria Zakharova told reporters.
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The Russian Embassy accused the United Kingdom of trying to "frighten its own citizens".
Britain blamed the poisoning of the Skripals on Russian Federation, prompting a serious diplomatic crisis between Moscow and Western states.
Meanwhile, Russian lawmaker Sergei Zheleznyak has described the incident as part of British efforts to tarnish the Russia-hosted World Cup and fuel tensions ahead of a planned US-Russia summit. The emergence of additional victims "will give it a renewed sense of urgency", particularly if one of them succumbs, said James Nixey, head of the Russian Federation and Eurasia program at Chatham House, a research group in London. "That is part of the anger I feel about the Russian state (in the Skripal case). that they chose to use clearly a very, very toxic, highly risky weapon".
Wiltshire Police are aware of the incident and are not commenting at this time.
Public Health England has repeated "highly precautionary advice" for people who had visited five locations identified by police, but insisted there is no immediate health risk.
Police confirm a man and woman were exposed to the Novichok nerve agent in Amesbury.
According to reports, investigators are concentrating their search on the homes of Ms Sturgess and Mr Rowley amid fears they picked the item up and took it back to either one of the properties.
Security Minister Ben Wallace told BBC News Thursday that the couple is likely just a victim of the consequences of the earlier attack and that they were not directly targeted.