A number of pupils that returned to school on Monday are now having to self-isolate after a coronavirus case was confirmed.
A member of staff at Elgin Academy is also having to quarantine.
The Moray secondary school – which reopened full-time to students on Monday following lockdown and the Easter holidays – remains open to those unaffected.
The school is working alongside NHS Grampian’s public health team and said all pupils self-isolating have been provided with information on how to access their learning from home.
A Moray Council spokesperson said: “Our main concern first and foremost is for the wellbeing and good health of those concerned and we wish them a speedy recovery and hope their family stay well.
“We’re in contact with NHS Grampian’s public health team, who advised on the cohort of pupils and a member of staff to be informed they should enter self-isolation, and will continue to advise us on matters of public health.
“These pupils have also been provided with information on how to access their learning from home.
“All Moray schools receive an enhanced clean daily as standard now in line with public health advice, including daytime sanitation, and this allows the rest of the school to continue as normal
“School buses, which are considered an extension of the school estate, are also cleaned after each run so we’re satisfied that Covid-19 safety measures continue to be met.
“We ask anyone contacted through the Test and Protect process to follow the guidance given, and any health-related questions are directed to the NHS.
“Families will continue to be kept informed by the school on any further action to be taken.”
A spokesperson for NHS Grampian added: “We are aware of a case of Covid-19 associated with Elgin Academy.
“Public health is working with the school’s management and Moray Council.
“Those affected, and their close contacts, are self-isolating.”