Let HelenBranswell and HoganAlex explain how an invisible shield part of a phenomenon known as herd immunity can keep us all healthy. httpsbuff.ly2HwFFiMÂ

Let @HelenBranswell and @HoganAlex explain how an invisible shield — part of a phenomenon known as “herd immunity” — can keep us all healthy. https://buff.ly/2HwFFiM 

17:46 EDT 22 May 2019 | STAT

Let @HelenBranswell and @HoganAlex explain how an invisible shield — part of a phenomenon known as “herd immunity” — can keep us all healthy. https://buff.ly/2HwFFiM 

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