资机制，即预先市场承诺，它将为低收入国家获得 COVID-19 疫苗提供支助。115截至 2020 年 11 月 19 日，已有 180 多个国家已经加入机制，相当于世界近三分之二的人口，其中包括 94 个高收入国家，它们全部作出了具有法律约束力的承诺。116 尽管 COVAX 仍是希望的灯塔，并且已经实现了一些承诺，但一些重要的自筹资金国家，主要是较富裕的国家，仍拒绝加入，或寻求与各制造商达成双边采购协议，而不是继续遵守对 COVAX 的承诺。
114 Within that framework there is also an entirely separate funding mechanism, the advance market commitment, which will support access to COVID-19 vaccines for lower-income States.115 By 19 November 2020, more than 180 countries, representing nearly two thirds of the world’s population, had joined, including 94 higher-income countries, all of which had made legally binding commitments.116 Although COVAX remains a beacon of hope, and is already realising some of its promise, a number of significant self-financing States, mostly the richer ones, continue to either refuse to join or pursue bilateral purchase agreements with the various manufacturers rather than remain committed to COVAX.