The first scientifically approved vaccine was:
Correct answer: B. Small Pox Vaccine
- A. Oral Polio vaccine
- B. Small Pox Vaccine
- C. MMR Vaccine
- D. Tetanus Vaccine
Explanation
The first scientifically approved vaccine was the smallpox vaccine. It was developed by Edward Jenner in the late 18th century. Jenner observed that milkmaids who had contracted cowpox, a less severe disease, seemed to be protected from smallpox. He tested his hypothesis by taking material from a cowpox sore and inoculating a young boy with it. The boy subsequently showed immunity to smallpox. Therefore, option b is correct.
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Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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