Which of the Following Types of Vaccine was Originally Used

Question

Which of the following types of vaccine was originally used by Pasteur?
A) an attenuated vaccine
B) an inactivated vaccine
C) a subunit vaccine
D) a mimic vaccine

Accepted Answer

Pasteur originally used attenuated vaccines, which are created by weakening a live pathogen to reduce its virulence while still eliciting an immune response.