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Vaccine developed and distributed (5 déc. 1940 – 27 oct. 1950)

Description:

New vaccine has 99% effectiveness and lasts for entire lifetime

Ajouté au bande de temps:

Amber, Danielle, Desiray, Isaac, and Ronald

1 déc. 2017

0

0

443

Date:

5 déc. 1940

27 oct. 1950

~ 9 years and 10 months

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