How vaccines crushed polio in the US in the mid 1950s and measles in Nigeria after 2005.
economist.com/graphic-detail… https://t.co/f3AsZRcEVV
@ummodern @zeithistoriker @HarvardSTS @CompCoRe_STS Say more. Say more.
@ummodern @zeithistoriker @HarvardSTS @CompCoRe_STS Say more. Say more.