The current regulations to enter Latvia from another EU country mandate that I have to self-isolate for 14 days on arrival if the country I am coming from has had more than 16 new Covid cases per 100k inhabitants in the past 14 days; the infection rates for each country are updated every Friday and are valid for the successive week.
Suppose that my country of origin is below the threshold when I enter Latvia, but gets above the threshold in the next update the following Friday, while I am already inside Latvia.
Do I have to report myself to the authorities and self-isolate? Or is that requirement only checked when I enter Latvia?
