Although Jenner’s contribution was significant, it was only one of many.About twenty years before Jenner, a farmer in England named Benjamin Jesty innoculated his family with cowpox virus to induce resistance to smallpox.
…………………………………………………………………………………………………………. यो मुलुक सिंगापुर जस्तो बनिसकेको छैन मात्र राजनीतिक परिवर्तन...