When did experimental administration of the HIV vaccine begin?
Correct answer: A. 2001
- A. 2001
- B. 1999
- C. 2005
- D. 2000
Explanation
By 2001, several early-phase clinical trials (Phase I and II) of experimental HIV vaccines were underway. These trials were carefully controlled and involved volunteers who were HIV-negative, but they were not exposed to the virus. Instead, vaccines used weakened viral components, viral proteins, or DNA/RNA sequences to safely provoke an immune response.
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