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The eradication of which acute and highly contagious disease, caused by a virus, has been achieved globally?

1. Variola virus
2. Mycobacterium tuberculosis
3. Clostridium tetani
4. Escherichia coli

Correct answer: Variola virus

Solution

Smallpox is caused by the Variola virus, a DNA virus, and has been eradicated globally through vaccination efforts. The other options are unrelated pathogens.

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