Visitors to a Nike conference at the centre of a covid-19 outbreak were taken on a walking tour by guides who claim they were not then tested for the virus.
The claim follows concerns at a the handling of tracing and testing after the gathering in Edinburgh in February - before coronavirus became a pandemic.
It was reported earlier that 20 Lloyds Banking Group staff shared hotel facilities with Nike delegates but were not traced for check-ups.
Nicola Sturgeon defending the response during her daily press briefing, saying it was right not to make the outbreak public at the time because of patient confidentiality.
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Today, Ian Murray, MP for Edinburgh South, said he was contacted by the walking tour group. They said delegates were split into smaller parties and taken around the city's Old Town.
Murray said: “As every day passes, the scale of the failure to contact trace those who engaged with Nike delegates becomes clearer.
“How many local residents did the delegates come into close contact with during the walking tour?
“This demonstrates why the Scottish Government was wrong to cover-up the ground-zero outbreak.
“If the government had been honest with the Edinburgh public about a major outbreak in the city centre, those who met with delegates could have come forward to help prevent the spread of the virus.
“It’s time for Nicola Sturgeon to admit her government made a major error of judgement and for an apology to the people of Edinburgh.”
Murray revealed the claim but said the walking tour group wants to remain anonymous.
Sturgeon, at her daily press conference in Edinburgh today, said an incident management team was established with public health officials to probe the incident and control infection.
The response was international because delegates came from different countries.
Sturgeon said: "The point I'm making is that the management team will do everything it thinks is necessary to protect public health. It would have contacted people who fitted the definition of a contact, and had they thought there was further action needed, they would have taken those actions. They are experts in these matters.
"In this case, the reason more information was not put into the public domain was to do with patient confidentiality.
"I want to be very clear - this is not a made-up reason. It was the real reason, and actually a legitimate reason, when case numbers was so low, and when the number of attendees from Scotland were also so low, that to name the event would have almost certainly have identified the patients."