Strengthening the immunization supply chain through EVM assessment: Comparing India's two successive national assessments.

Background: Effective immunization supply chain (iSC) is crucial for safe and timely transport of potent vaccines to the beneficiary. India's iSC, with a network of ~29,000 cold chain points (CCP), measures its quality standards using the World Health Organization-United Nations International Children's Emergency Fund (WHO-UNICEF) global tool on effective vaccine management (EVM). The two national EVM assessments (EVMA) were conducted in 2013 and 2018.