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The move came as the U.N. agency ended its six-day World Health Assembly this year, after plans to adopt a more sweeping pandemic “treaty” at the meeting largely over disagreements between developing countries and richer ones about better sharing of technology and the pathogens that trigger outbreaks.

But countries agreed to complete negotiations on the pandemic accord with the year, “at the latest,” WHO said.

“The success of the IHR amendments demonstrates that in our divided and divisive world, countries can still come together to find common cause and common ground,” Director-General Tedros Adhanom Ghebreyesus said.

Lawrence Gostin, a public health law expert at Georgetown University, hailed a “big win for health security,” and posted on X that the move “will simplify negotiations for the pandemic agreement.”

WHO said countries have defined a pandemic emergency as a communicable disease that has a “wide geographical spread” or a high risk of one, and has exceeded or can exceed the ability of national health systems to respond.

It's also defined as an outbreak that has or could cause “substantial” economic or social disruption and requires quick international action, the agency said.

WHO legal officer Steven Solomon said the move to revise the health regulations does not take effect immediately, but will come into force a year after Tedros formally notifies countries of the decision.

Yuanqiong Hu, a senior legal and policy adviser at Doctors without Borders, said that the changes adopted Saturday include “important provisions addressing equity in access to health products during global health emergencies.”