Recommendations from the Swedish Public Health Authority (Folkhälsomyndigheten): “Stay home if you are sick, when you have symptoms like fever, cough, running nose, sore throat. Take care of our elderly and frail”. Photo: Jessica Gow/TT.

In mid-March of this year, while Southern Europe was experiencing a fast spread of COVID-19, Northern Europe was witnessing the spread of the herd immunity idea, since then irredeemably associated with the COVID-19 discussion.

Herd immunity means that, when the majority of the population becomes infected with a virus, those…

Barbara C.

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