A GP at a Glasgow medical practice has tested positive for coronavirus.
A patient who was infected with Covid-19 visited Crookston Medical Centre last week and the doctor became unwell later that night.
The GP did not see the coronavirus patient but instead caught the illness "after a likely unrelated exposure due to the almost simultaneous timescale of the symptoms".
The medical centre warned: "It is thus highly likely that the virus is much more prevalent in our country than would appear to be the case from the official figures and hence the reason that we need to continue to be vigilant and wherever possible self-isolate if we develop symptoms of new onset cough, fever, muscle pains and breathing difficulties."
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Crookston Medical Centre said the coronavirus patient visited the surgery last Wednesday.
The doctor subsequently tested positive and the practice was informed of the result on Sunday.
As of Monday, 171 people have tested positive for coronavirus in Scotland. One patient has died.
There have been 1,543 confirmed cases and 55 deaths across the UK.
The number of infections is likely much higher, however, because people with mild symptoms aren't being tested and many carriers won't show symptoms for about five days or at all.
Nicola Sturgeon said she is surprised by the speed coronavirus is spreading and warned we are "on the cusp of a rapid acceleration", as she urged the public to follow advice about reducing social contact.
The First Minister said she was being "frank and transparent" with people about the need to reduce non-essential contact with others, with the latest advice to avoid pubs, restaurants and public events.
Expressing "enormous sympathy" for businesses affected by the measures, Ms Sturgeon said "every penny" of extra funding from Westminster would go to helping businesses and public services cope with the pandemic.
The latest advice is that people showing symptoms of Covid-19 - namely a persistent cough or a fever - should self-isolate for 14 days, along with every member of their household, in addition to urging people to "socially distance".
On Tuesday morning, Ms Sturgeon told the BBC's Good Morning Scotland that the policies and advice were being guided "by the best scientific and medical expertise" but that the virus was spreading faster than expected.
Addressing the measures announced on Monday, Ms Sturgeon said: "What changed yesterday, is that the speed and the extent of the spread is beyond what had previously been anticipated.
"That is particularly true now in London, but all of us are on the cusp of a rapid acceleration and that is why the measures that were announced yesterday represent such a step up in the actions that are being advised."
The number of confirmed cases in Scotland rose to 171 on Monday.
Explaining the current guidance, Ms Sturgeon said: "We're asking the general population to significantly reduce their social interaction, so if you are able work from home, do.
"Don't go to the pub, cinema or theatre in the way that you would normally do. Avoid unnecessary travel, stay at home more than you would otherwise do.
"That advice is to the general public, but the advice is particularly strong for people over 70 and also for people who have underlying health conditions for which they would get the flu vaccine in a usual year, and also for pregnant women."
Those with immune system problems will be receiving "tailored information directly", Ms Sturgeon added.
She said: "I want to be very clear with people, we are considering all of these things incredibly carefully.
"None of these are easy judgements to take.
"We will not always get these things right, but we will strive to get them as right as we possibly can in a very difficult situation, being guided by the best possible scientific advice, applying judgement to that and doing everything we can to keep the public as a whole - particularly those who are most vulnerable - as safe as we possibly can."
Ms Sturgeon said it is "inevitable that we will see significant additional measures taken".
She added: "I give a guarantee that every penny of additional that is announced by the Treasury as far as Scotland is concerned will be passed on to those who need that."
