Pasteur developed a vaccine to rabies by injecting which of the following into patients?

Question

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Pasteur developed a vaccine for rabies by first identifying the pathogen responsible for the disease in 1881. He then attenuated the virus by drying out the spinal cords of rabbits infected with rabies. This weakened the virus so that it would no longer cause the disease in humans. Pasteur further weakened the virus by exposed it to air and light, which decreased its virulence even more. This attenuated virus was used to vaccinate patients with rabies, allowing them to build up immunity to the virus without becoming sick. The vaccine was first used on a 9-year-old boy who had been bitten by a rabid dog and who thus faced certain death without intervention. The vaccine worked, and the boy did not develop rabies.

Pasteur Developed a Vaccine to Rabies by Injecting Which of the Following