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As more people flock to the backyard poultry trend, the number of salmonella infections are likely to increase, says Illinois Department of Public Health veterinarian Dr. Connie Austin.

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Following years of steady decreases, a new report by the Centers for Disease Control and Prevention shows a significant rise in teen overdose deaths in 2015. “It’s disappointing,” said Renee Manworren, a local researcher.

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“Too many children have died or are traumatized by gun violence,” said Dr. Mark Slidell of Comer Children’s Hospital. “The impact of gun violence on children is a serious public health problem.”

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For the first time in more than two decades, American life expectancy is dropping. Is this cause for alarm?

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A look at some breakthrough treatments for HIV and AIDS and a landmark clinical trial for a vaccine ahead of World AIDS Day.

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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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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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Opioid and heroin overdose deaths hit record levels in 2014, according to the Center for Disease Control and Prevention. The alarming rise in heroin deaths has tripled since 2010. "Chicago Tonight" talks about the heroin crisis with the executive director of a treatment facility and the founder of an anti-heroin education and advocacy foundation.

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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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Chicago animal shelters like PAWS are still coping with the spread of a new, highly contagious strain of canine influenza. In the U.S., the outbreak of the H3N2 dog flu virus was first found in Chicago last year. It's now spreading to western states.

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The antibiotic stewardship program is offered in a health care facility or hospital that is designed to help improve the way antibiotics are used and prescribed. Read an article.

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The Centers for Disease Control says there may be as many as 48 million cases of foodborne illnesses every year in the United States, costing the economy more than $150 billion and resulting in around 3,000 deaths. We talk with two food safety experts about the impact new technologies are having in keeping our food safe. Read an article.

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Autism rates have dramatically increased over the past 10 years. Why the jump? And why are boys more susceptible to autism? We take a look.