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Credit score…Dale De La Rey/Agence France-Presse — Getty Photographs

The World Well being Group, usually criticized for being too gradual to declare in 2020 {that a} pandemic was underway, now says — two years to the day after making that declaration — that many international locations are being too fast to declare it over and let down their guard.

By the point Dr. Tedros Adhanom Ghebreyesus, the company’s director normal, formally declared the unfold of the coronavirus to be a pandemic within the early night of March 11, 2020, the virus was already identified to have contaminated greater than 120,000 individuals in 114 international locations, killing about 4,300.

Then as now, the company, an arm of the United Nations, tended to maneuver cautiously and methodically. It was solely after weeks of near-daily media briefings, during which he referred to as on the group’s almost 200 member international locations to comprise the virus by way of testing, contact tracing and isolation of those that may be contaminated, that Dr. Tedros made the change to calling the disaster a pandemic. He did it, he mentioned then, to draw consideration, as a result of many international locations weren’t taking severely the group’s earlier declaration of a public well being emergency.

It labored.

“My first remark that day was, it was about time,” Dr. Georges Benjamin, the chief director of the American Public Well being Affiliation, recalled in an interview this week. “We had been in a pandemic for some time, and never essentially behaving that method. We wanted that message to jump-start it, from a world perspective.”

That day, the N.B.A. suspended its season and the actors Tom Hanks and Rita Wilson, his spouse, introduced they’d contracted the virus. Within the days that adopted, Broadway closed its curtains, inventory markets plunged and colleges and companies shut their doorways. President Donald J. Trump shut U.S. borders to most vacationers from continental Europe. The identified toll in the USA on March 11 stood at 1,263 circumstances and 37 deaths; quickly the nation could be the worldwide epicenter of the pandemic.

Two years later, American states and plenty of international locations are dashing to drop public well being precautions, scale back testing and elevate restrictions, citing the swift decline of the Omicron surge — and the W.H.O. is saying: Not so quick.

In a number of boards this week, the company urged continued vigilance, particularly about inequities. In a stark replace on the risk the virus continues to pose, the W.H.O.’s regional arm for the Americas mentioned that the Western Hemisphere, with lower than 13 p.c of the world’s inhabitants, had reported 63 p.c of all new identified coronavirus circumstances within the first two months of 2022.

“This virus has fooled us each time,” Dr. Benjamin mentioned. “That’s why they’re appropriately cautious.”

The company has been making an attempt for months to maintain its wealthier member nations from racing far forward of the remainder. In August, the W.H.O. sought a moratorium on booster pictures to liberate vaccine doses for the billions of individuals nonetheless unvaccinated in poorer international locations, with exceptions just for immunocompromised individuals. Not till Tuesday did the company give a broader endorsement of booster pictures.

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That was adopted on Wednesday by a brand new advice to vastly increase provides of self-testing kits in poor international locations, the place skilled testing could be burdensomely costly.

“This inhibits our skill to see the place the Covid-19 virus is, the way it’s spreading and evolving,” Dr. Tedros mentioned of the shortage of testing in poor international locations.

However it could possibly be months earlier than the check initiative makes a lot headway, if the struggles of Covax, the worldwide coronavirus vaccine distribution program, are any information. Solely 14 p.c of individuals within the low-income nations that Covax is supposed to assist most have obtained a dose, in keeping with the Our World in Information undertaking on the College of Oxford.

With greater than 10 million new coronavirus circumstances reported final week — virtually certainly an undercount, as a result of testing charges have declined considerably — the W.H.O.’s greatest problem now is identical because it was two years in the past: getting the member international locations that finance its work to heed its warnings.

“The pandemic is way from over,” Dr. Tedros mentioned on Wednesday, “and it’ll not be over anyplace till it’s over in all places.”