Sources:
https://www.nationalobserver.com/2021/07/20/opinion/canada-herd-immunity-covid-anti-vaxxers
https://twitter.com/DanDicksPFT/status/1417536239356375041
https://www.ynetnews.com/health_science/article/bytq34n0u
https://www.businessinsider.com/fully-vaccinated-people-not-immune-to-covid-milder-2021-7
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