Answer:
The critical situation about epidemics, poliomyelitis was Public Health problem.
Explanation:
When Salks presented the vaccine to stop poliomyelitis, the situation was really critical. From the 58,000 cases, 3,145 died and 21,269 were affected with paralysis, that's how critical was the situation.
Also, Jonas Salks dedicated part of his life to this issue, because he refused to work in a hospital, his motivation was do research.
This problem is considered as the biggest public health problem in the post war era.
