**Vaccine Development:** 1. **1932:** Maurice Brodie began …

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**Vaccine Development:**
1. **1932:** Maurice Brodie began developing the first live virus vaccine by passing the virus through monkeys. His work, though criticized for its methods, showed promising results in field trials[2].
2. **1949:** John Enders, Thomas Weller, and Frederick Robbins successfully cultivated poliovirus in human tissue, winning the 1954 Nobel Prize for their work[1].
3. **1955:** Jonas Salk announced the success of his inactivated poliovirus vaccine (IPV), which was licensed on the same day[1][4].
4. **1961:** Albert Sabin developed an attenuated live oral poliovirus vaccine (OPV), which came into commercial use[2].