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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.

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(Aedes albopictus)

The city on Monday morning confirmed the first case of Zika virus. The patient, who was identified as a woman in her 30s, visited Presence Saint Joseph Hospital after returning from a trip to Columbia with symptoms consistent with the virus.

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(Aedes albopictus)

On Monday, the World Health Organization declared the Zika virus an international public health emergency. Dr. Allison Arwady, chief medical officer of the Chicago Department of Public Health, joins us to discuss the virus and the risk it poses to Chicago jet-setters.

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We share what you had to say about some of our recent stories when we read viewer feedback from the "Chicago Tonight" website, and our Facebook and Twitter pages.

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(Senior Airman Jarvie Z. Wallace/U.S. Air Force)

Hot dogs, bacon and other processed meats can cause cancer as well as red meats, according to a new report by the World Health Organization’s research division. How much is too much? We discuss the findings with a dietician and a professor whose research focuses on meat sciences.

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The World Health Organization warns that the rise of antibiotic-resistant bacteria or "superbugs" means that we could be on the brink of a "post-antibiotic era" in which common infections and minor injuries can once again kill. They say the situation is "so serious that it threatens the achievements of modern medicine." We talk with two experts about the scale of the threat and what we can all do to try and contain it.

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