**Key Milestones:** 1. **Mass Vaccination Campaigns:** Larg…

**Key Milestones:**
1. **Mass Vaccination Campaigns:** Large-scale vaccination efforts in countries like China, India, and Pakistan, supported by organizations such as Rotary International and the World Health Organization, played a crucial role in reducing polio cases[1][3].
2. **Global Collaboration:** International cooperation and assistance were critical in expanding vaccine production, improving surveillance, and conducting mass vaccination campaigns[1][3].
3. **Type-specific Eradication:** Type 2 wild poliovirus was declared eradicated in 2015, and by 2021, only two cases of wild poliovirus had been recorded globally, in Afghanistan and Pakistan[1][3].