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> Who claimed this?

Plenty of governments were pushing vaccination campaigns with tales of "herd immunity".

> According to the Robert Koch Institute, Germany’s center for disease control, the new, highly contagious virus variants mean that herd immunity can only be reached if 80 percent of the population is vaccinated.

The Race for Herd Immunity [0]

[0] https://www.spiegel.de/international/germany/germany-s-vacci...

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