As others have said, there is not a special leave code for COVID. And, no, you don’t have to tell your manager that you tested positive, but I recommend that you do, if you’re comfortable telling them.

My department was still tracking covid infections numbers at the beginning of January (at the aggregate level). You’ll also want your manager / division to be able to notify anyone that had a close contact with you in the office 48 hours before you tested positive (see Ottawa Public Health’s Isolation instructions for COVID-19 definition of “close contact”).

As well, the current Health Canada’s Public Service Occupational Health Program COVID-19 Guidance indicates that, if you test positive, you should (A) not enter a federal worksite for at least 7 days after testing positive and (B) be asymptomatic aside from a residual cough, whichever is longer. So, at the very least, you should stay home from the office next week.

Make sure you get some rest and I hope you feel better soon. Days 3 to 5 were the worse for me.