RT @page_eco: A brilliant demonstration of how ‘herd immunity’ works with vaccinations. by @RARohde https://t.co/mmJFklo7Oq

A brilliant demonstration of how ‘herd immunity’ works with vaccinations.

by @RARohdepic.twitter.com/mmJFklo7Oq

— Lionel Page (@page_eco) October 3, 2019

from Twitter https://twitter.com/danbrewer