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@MikkoKorhonen12 https://t.co/SbN7E9Ofgx "herd immunity for polio is about 80%."
@MikkoKorhonen12 https://t.co/SbN7E9Ofgx "herd immunity for polio is about 80%."
RT @metaglossia: Can Africa achieve herd immunity? https://t.co/oiMZgaze9D
Can Africa achieve herd immunity? >> https://t.co/CSep76QkaK 4/7 https://t.co/YMmoIfp3s2
Can Africa achieve herd immunity? https://t.co/oiMZgaze9D