Which English doctor developed the first successful smallpox vaccine in 1796?

What observation led Edward Jenner to develop his smallpox vaccine?

Which deadly disease did Jonas Salk create a vaccine for in 1955?

What made the polio vaccine trials of 1954 historically significant beyond the disease itself?

Which organization led the global campaign that successfully eradicated smallpox by 1980?

What strategy did health workers use to contain the final smallpox outbreaks in the 1970s?

Which childhood disease did the MMR vaccine introduced in 1971 protect against?

What did the development of the rabies vaccine by Louis Pasteur in 1885 prove for the first time?

Which disease remains a leading cause of death in developing countries despite having an effective vaccine since 1921?

What breakthrough allowed scientists to develop COVID-19 vaccines in record time starting in 2020?