how did the Indians manage to save their children from a major attack of smallpox?
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A prevention at that time was using small pox virus itself was a vaccine available
Even though many people at that time was attacked by small pox virus milk vendors were not effected by small pox...
A scientist at that time realised this thing and started this small pox virus itself as a vaccine but in small amounts only.. because small amounts causes primary response and it's successive response which is called secondary immune response which causes release many antibodies...
hope this helps u
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