NHS Grampian says the cases are associated with The Hawthorn Bar in the city centre.
Alexander Fenty, known as Akie, from Peterhead died on Sunday leaving behind a teenage daughter.
Bruce Melvin's kidney transplant has been put on hold because of the coronavirus outbreak.
Gartly primary was temporarily closed in December 2018 after an oil leak contaminated the site.
Peterhead chairman Rodger Morrison has opened up his B&B to NHS staff to let them rest in between lengthy hospital shifts.
The health board appealed for extra staff to deal with coronavirus.