Bars, restaurants and cafes are being shut in Aberdeen under the reimposition of coronavirus lockdown measures.
Speaking at her daily coronavirus briefing on Wednesday, Ms Sturgeon said 54 cases had been reported in recent days as part of a cluster of infections in Aberdeen.
Local health officials have linked a number of cases to The Hawthorn Bar, which has shut voluntarily for 14 days, in the city’s centre.
According to Ms Sturgeon, more than 20 other pubs and restaurants are also involved in the cluster.
She said the rise in cases had heightened fears the Scottish government is “dealing with a significant outbreak in Aberdeen that may include some community transmission”.
Under the reimposed restrictions, residents in the Aberdeen city area are being told to travel no more than five miles from their home.