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(CNN)

Additional monkeypox vaccines are arriving in Chicago, but they will be in limited supply. This as the World Health Organization this declared monkeypox a public health emergency. 

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This 2003 electron microscope image made available by the Centers for Disease Control and Prevention shows mature, oval-shaped monkeypox virions, left, and spherical immature virions, right, obtained from a sample of human skin associated with the 2003 prairie dog outbreak. (Cynthia S. Goldsmith, Russell Regner / CDC via AP, File)

WHO Director-General Tedros Adhanom Ghebreyesus said Tuesday he decided to convene the emergency committee on June 23 because the virus has shown “unusual” recent behavior by spreading in countries well beyond parts of Africa, where it is endemic.

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A worker in protectively overalls and carrying disinfecting equipment walks outside the Wuhan Central Hospital, China on Feb. 6, 2021. (AP Photo / Ng Han Guan, File)

That stance marks a sharp reversal of the U.N. health agency’s initial assessment of the pandemic’s origins. WHO concluded last year that it was “extremely unlikely” COVID-19 might have spilled into humans from a lab.

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Two people wearing masks walk in Regents Park in London, Monday, March 23, 2020. (AP Photo / Frank Augstein, File)

There were more than 12 million new weekly cases and just under 33,000 deaths, a 23% decline in mortality, according to the U.N. health agency’s report on the pandemic issued late Tuesday.

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Can you get long COVID after an infection with omicron? (AP Illustration / Peter Hamlin)

It’s too early to know for sure, but many doctors believe it’s possible to have long-term effects from the omicron variant of the virus.

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In this Thursday, Sept. 2, 2021 file photo, a health worker prepares Pfizer vaccines during the national COVID-19 vaccination campaign in Pamplona, northern Spain. (AP Photo / Alvaro Barrientos, File)

The head of the World Health Organization is calling on rich countries with large supplies of coronavirus vaccines to refrain from offering booster shots through the end of the year, expanding an earlier request that has largely fallen on deaf ears.

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In this Monday, May 24, 2021 file photo, Tedros Adhanom Ghebreyesus, director general of the World Health Organization (WHO), speaks during a bilateral meeting with Swiss Interior and Health Minister Alain Berset at the WHO headquarters, in Geneva, Switzerland. (Laurent Gillieron / Keystone via AP, File)

The head of the World Health Organization said the COVID-19 delta variant, first seen in India, is “the most transmissible of the variants identified so far,” and warned it is now spreading in at least 85 countries.

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In this Feb. 9, 2021, file photo, Peter Ben Embarek of the World Health Organization team holds up a chart showing pathways of transmission of the virus during a joint news conference at the end of the WHO mission in Wuhan in central China's Hubei province. (AP Photo / Ng Han Guan, File)

A joint World Health Organization-China study on the origins of COVID-19 says that transmission of the virus from bats to humans through another animal is the most likely scenario and that a lab leak is “extremely unlikely,” according to a draft copy obtained by The Associated Press. 

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In this Monday, Feb. 24, 2020 file photo, Michael Ryan, left, Executive Director of WHO's Health Emergencies program, next to Tedros Adhanom Ghebreyesus, right, Director General of the World Health Organization (WHO), addresses a press conference about the update on COVID-19 at the World Health Organization headquarters in Geneva, Switzerland. (Salvatore Di Nolfi / Keystone via AP, File)

A senior World Health Organization official said Monday it was “premature” and “unrealistic” to think the pandemic might be stopped by the end of the year, but that the recent arrival of effective vaccines could at least help dramatically reduce hospitalizations and death.

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Marion Koopmans, right, and Peter Ben Embarek, center, of the World Health Organization team say farewell to their Chinese counterpart Liang Wannian, left, after a WHO-China Joint Study Press Conference held at the end of the WHO mission in Wuhan, China, Tuesday, Feb. 9, 2021. (AP Photo / Ng Han Guan)

The coronavirus most likely first appeared in humans after jumping from an animal, a team of international and Chinese scientists looking for the origins of COVID-19 said Tuesday, dismissing as unlikely an alternate theory that the virus leaked from a Chinese lab. 

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Pedestrians wear masks as they cross a street amid the coronavirus pandemic Sunday, July 12, 2020, in Santa Monica, Calif. (AP Photo / Marcio Jose Sanchez)

The United States was grappling with the worst coronavirus outbreak in the world on Monday. Meanwhile, two World Health Organization experts went to China for a mission to trace the origin of the pandemic.

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In this Friday, June 26, 2020 file photo, people wear masks while exercising at a gym in Los Angeles. (AP Photo / Jae C. Hong)

In a change to its previous thinking, WHO noted on Thursday that studies evaluating COVID-19 outbreaks in restaurants, choir practices and fitness classes suggested the virus might have been spread in the air.

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President Donald Trump arrives to speak about the coronavirus in the Rose Garden of the White House, Tuesday, April 14, 2020, in Washington. (AP Photo / Alex Brandon)

The United States is WHO’s largest single donor, contributing between $400 million and $500 million annually to the Geneva-based agency in recent years.

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In this Tuesday, March, 10, 2020 photo, paramedics test samples taken from patients suspected of being infected with the new coronavirus, at a laboratory in the southwestern city of Ahvaz, Iran. (Amin Nazari / ISNA via AP)

Expressing alarm both about mounting infections and inadequate government responses, the World Health Organization declared Wednesday that the global coronavirus crisis is now a pandemic but added that it’s not too late for countries to act.

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(phoenix!! / Flickr)

Handwashing. It’s something we’ve all be doing since we were toddlers and, as it turns out, we’ve probably been doing it wrong. The World Health Organization shows us how it’s really done.

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The Zika virus has been shown to cause microcephaly and other fetal brain abnormalities. We talk with a local woman, pregnant with her first child, who has been dealing with the terrifying possibility that she and her unborn child may have been exposed to the virus.