The resolution called for an "impartial, independent and comprehensive evaluation" of the international response to the pandemic.
World Health Organization member states agreed Tuesday to an independent probe into the UN agency's coronavirus response as US criticism mounted over its handling of the pandemic.
They also agreed to push for equitable access for any treatments or vaccines developed against COVID-19, and urged an international probe into the origins of the new virus.
Countries taking part in the WHO's annual assembly, being held virtually for the first time, adopted a resolution by consensus urging a joint response to the crisis.
The resolution called for an "impartial, independent and comprehensive evaluation" of the international response to the pandemic, which has so far infected more than 4.8 million people and killed more than 318,000.