Question

research with hela cells allowed jonas salk to test his vaccine for ____, which reached its peak in the early 1950s.
○ hiv
○ mumps
○ polio
○ measles

Explanation:

Jonas Salk is known for developing the polio vaccine. Polio was a major public health concern that peaked in the early 1950s. HIV was discovered much later, and mumps and measles vaccines were developed by other researchers or in different timeframes. HeLa cells were used in polio vaccine research.

Answer:

C. Polio