کھرنڈ پیس کر مریضوں کی ناک میں چڑھانا یا زخم کی پس تندرست فرد کو لگانا سننے میں تو بہت عجیب لگتا ہے لیکن ویکسین کی تیاری کی تاریخ میں ان دونوں اعمال کا بہت اہم کردار ہے۔ جانیے ویکسین کی ایک ہزار سال قدیم تاریخ بی بی سی کی اس ڈیجیٹل ویڈیو میں۔
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