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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.