Roses are red,
Violets are blue,
Herd Immunity,
Is still pretty cool
#healthpolicyvalentines #vaccineswork
https://medium.com/@gidmk/herd-immunity-is-pretty-cool-adbc52630f9f#.80ajwjmf6 …
4:48 PM - 12 Feb 2017
0 replies
11 retweets
24 likes
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