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A vaccine prepared by inactivating a bacterial toxin with formaldehyde so the body forms antibodies against it is called a:
A{'text': 'Live attenuated vaccine'}
B{'text': 'Subunit vaccine'}
C{'text': 'Toxoid vaccine'}
D{'text': 'Cross-protection vaccine'}
Answer & Solution
Correct answer: C. {'text': 'Toxoid vaccine'}
1. Some bacterial diseases (tetanus, diphtheria) are caused by toxins.
2. The toxin is inactivated with formaldehyde so it cannot harm cells, but the body still recognises it.
3. Such a preparation is called a **toxoid vaccine**.
4. A live attenuated vaccine uses weakened live germs; subunit uses fragments; cross-protection uses a related organism like cowpox for smallpox.
5. Hence the correct answer is **toxoid vaccine**.
_Source: Selina Concise ICSE Class 8 Biology Ch 8 "Diseases and First Aid", Vaccine preparation types_
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