Smallpox has been eradicated, but malaria and cholera have not.
Which statements correctly explain this?
1) Cholera pathogens in the intestines are not destroyed by antibiotics.
2) Plasmodium antigens change during the life cycle.
3) Smallpox antigens remain stable.
4) Vaccines only work against viruses.
1, 2 and 3
2 )
1, 2 and 4
3 )
1, 3 and 4
4 )
2, 3 and 4
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