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JRPGfan said:

Also we dont know if you actually ever become immune, or if you do how long it lasts.
Maybe "immunity" only lasts a few months, and then next time (a year lateron) covid19 comes back, it starts infecting sweden again anyways.

When Sweden thinks they have reached "herd immunity" in May, it will be interesting to see what happens when Swedes try to cross the border in the next weeks. After all, if a Swede shows up at an airport/seaport/border, it is pretty sure s/he is infected..