Understand the Problem
The text discusses the development of a successful polio vaccine by Salk, including the process of inactivation of the virus, clinical trials, and the subsequent challenges faced with the vaccine. It highlights key events in medical history related to the vaccine's testing and effectiveness.
Answer
Clinical trials began in 1954.
The final answer is Clinical trials for the Salk polio vaccine began in the United States and parts of Canada in 1954.
Answer for screen readers
The final answer is Clinical trials for the Salk polio vaccine began in the United States and parts of Canada in 1954.
More Information
Jonas Salk's polio vaccine was a medical breakthrough using inactivated poliovirus, with clinical trials commencing in 1954, leading to widespread vaccination.
Tips
Ensure accuracy by confirming the year from multiple sources, as medical history timelines are essential for context.
