A total of 82 cases of coronavirus are now being associated with the student population at Aberdeen University.
The local incident management team said the cases were not being treated as a single cluster.
On Tuesday it was revealed many of the students involved, including some living in university halls and private flats, had visited The Bobbin pub on King Street.
Some staff at the pub are self-isolating.
NHS Grampian said: "A multi-agency investigation is ongoing into 82 cases of Covid-19 identified within the University of Aberdeen student population.
"Efforts are being made to identify any linkages between them.
"There is currently no evidence of spread to the wider community."
The Bobbin has said all staff operating between the dates of the visit around 17 September have been self-isolating, with a new bar team in place.
Meanwhile, the number of confirmed Covid-19 cases at two student halls in Dundee has risen to 98, an increase of 12 since Tuesday.
NHS Tayside said there were now 74 cases at Parker House, run by private company IQ, and 24 cases at Abertay University's Meadowside Halls.
Students at Aberdeen University have been warned that fines could be imposed for coronavirus rule breaches.
There is a warning of "robust action", with fines of up to £250. There is also the potential for further action - including suspension or expulsion.
Some students said it was a "disappointing" stance being taken by the university.