Which statements is/are correct with reference to the animal serum in vaccines?

Question

Options:

A . Horses used to be injected with small doses of bacteria that caused diphtheria so that they could develop antibodies.

B . None of these

C . Both A & B

D . The use of horse serum as an antibody supplement in the diphtheria vaccine is more than 100 years old.

Answer: Option C

The use of horse serum as an antibody supplement in the diphtheria vaccine is more than 100 years old. Horses used to be injected with small doses of bacteria that caused diphtheria so that they could develop antibodies.

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