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The Salk polio vaccine is best described as:
A{'text': 'An oral live attenuated vaccine'}
B{'text': 'A bacterial toxoid vaccine'}
C{'text': 'An injected inactivated vaccine'}
D{'text': 'A purified protein subunit vaccine'}
Answer & Solution
Correct answer: C. {'text': 'An injected inactivated vaccine'}
1. There are two main polio vaccines: Sabin (oral, live attenuated) and Salk (injected).
2. The Salk vaccine uses **inactivated** poliovirus that cannot replicate but still stimulates antibodies.
3. It is given by **injection**, not orally.
4. So Salk is best described as an **injected inactivated vaccine**.
5. Toxoid vaccines are for tetanus/diphtheria; subunit vaccines use protein fragments.
_Source: Selina Concise ICSE Class 8 Biology Ch 8 "Diseases and First Aid", Vaccine preparation types_
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