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The scientist who invented the vaccine …

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The scientist who invented the vaccine of polio 1st
  • 4 answers

Samruddhi Br 6 years, 9 months ago

Jonas Salk

Ritika Ritu 6 years, 9 months ago

No it is not in the ncert Book only the scientist who invented small pox is there

Birender Singh Bhati 6 years, 9 months ago

Is it in ncert book

Ritika Ritu 6 years, 9 months ago

Jonas Salk in 1955
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