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It was the worst act of terrorism in our country's history and the deadliest day ever for first responders. Of the 2,700 people killed in New York City, more than 400 were firefighters, paramedics, and police officers. In the 19 years since, more than 200 first responders have died after a chronic illness. Learn more about what researchers are now looking for as they study the remains of ground zero.

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According to a recent Gallup Poll, four in five Americans believe it is risky to go to healthcare facilities right now. Telemedicine provides a safer alternative, but for some technology-challenged people, that might not be an option. Learn how some doctors are bringing healthcare straight to the patients who need it the most.

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It's called achalasia, where people lose the ability to swallow. It's far more serious than heartburn, acid reflux, and GERD, and it can lead to death, but a new, less invasive technique is making it possible for patients to swallow again.

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Fever, chills, shortness of breath, fatigue, muscle aches, body aches, headaches, nausea, vomiting all sound like the symptoms of COVID-19, but actually, it's Lyme disease, and this year is expected to be an exceptionally bad year for ticks. In fact, because more people are spending time outdoors and in the wilderness due to the pandemic, experts said they fear more people will come down with Lyme disease. We talked with one teen who is on a mission to educate, track and cure the life-altering disease.

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There have been more six million confirmed cases of COVID-19 in the United States. For those who have recovered, the path can be a long one. The more time spent in the intensive care unit and on a ventilator, the harder and longer it will be to get back to normal... or get to a new normal.

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September is Thyroid Cancer Awareness Month. Ninety percent of all patients are cured if it's caught early, but for those with medullary thyroid cancer, a rare form of the disease, there have been few effective options. Now, the first young man in the country is being treated with a life-saving drug, which was at first prescribed for adults only.

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Nearly two million people in the United States are living with the loss of a limb. The causes vary, from vascular disease to cancer and trauma, and it's estimated half of all amputees with powered prosthesis don't use them. They don't like how they feel or that they cannot feel. Now, the first amputees are experiencing the sense of touch.

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One in 50 children is living with a disability, whether it's autism, Down syndrome, epilepsy, dyslexia, muscular dystrophy. The list goes on and on, and although living with a disability isn't necessarily rare, it can be very lonely and isolating. That's why one young woman is working to connect these kids, to show them they are not alone.

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It's been more than five months since the coronavirus pandemic hit the United States. The social isolation is hitting some people hard, physically and mentally. In fact, one third of Americans are showing signs of clinical anxiety and depression. Learn how the power of music may help calm the stresses of COVID-19.

Companies are struggling to recruit diverse volunteers in final U.S. tests of possible COVID-19 vaccines. Minority enrollment in studies of two shots has inched up in recent weeks, but even more is needed this fall as additional vaccine testing gets underway over the next two months. New recruitment efforts are gearing up, with the help of trusted voices in hard-hit communities of color, such as Spanish-speaking “health promoters” and Black pastors. The outreach is getting a late start. But it's critical to prove if the vaccines work in all the populations who will need them. 

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The Sicilian town of Corleone, made famous by the fictional Mafia clan in “The Godfather,” has ordered schools closed and a limited lockdown after a spate of coronavirus infections were tied to a big wedding there last week. The city administration told all 250 guests at the Sept. 12 wedding and anyone who lives with them to self-isolate and inform their doctors and city health authorities while awaiting tests. In a Facebook post, Mayor Nicolò Nicolosi said he expected “maximum cooperation to overcome the current crisis.” The town, which is part of the province of Palermo, has reported at least seven positive cases in recent days. Nicolosi said Friday that schools in Corleone and nearby towns were ordered closed because 30 of the wedding guests were students.

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The World Food Program chief warns that millions of people are closer to starvation because of the deadly combination of conflict, climate change and the COVID-19 pandemic. The U.N. program’s chief David Beasley urged donor nations and billionaires to help feed them and ensure their survival. He told the U.N. Security Council that the response to his warning five months ago of a potential “hunger pandemic” had averted famine but the work wasn’t done. He warned famine was possible in up to three dozen countries and could overwhelm places already weakened by conflict. He cited Congo and Yemen in particular as places where help was needed to keep people from starving.

India’s coronavirus cases have jumped by more than 96,000 in the past 24 hours, showing little sign of leveling. The new infections sent India's total past 5.21 million. The health ministry says 1,174 more people died. Experts say India's death toll of more than 84,000 may be a significant undercount. India is expected to pass the United States within weeks for the highest number of confirmed infections. Indian Prime Minister Narendra Modi on his birthday on Thursday made a fresh appeal to people to wear masks and maintain social distancing.

It was the worst act of terrorism in our country's history and the deadliest day ever for first responders. Of the 2,700 people killed in New York City, more than 400 were firefighters, paramedics, and police officers. In the 19 years since, more than 200 first responders have died after a chronic illness. Learn more about what researchers are now looking for as they study the remains of ground zero.

The gulf between President Donald Trump and public health experts over wearing face masks keeps getting wider. Trump has gone back and forth on face masks in the roughly six months since the coronavirus took root in the U.S., muddying the message from doctors and health officials who say masks are crucial to slowing the spread of the virus. White House officials insist Trump has always supported mask wearing. But the president's own words and actions tell a very different and, to some, a very puzzling story.

Britain has imposed tougher restrictions on people and businesses in parts of northeastern England as the nation attempts to stem the spread of COVID-19 before the colder winter months. Health Secretary Matt Hancock told the House of Commons on Thursday that the new measures would include a ban on residents socializing with people outside their households, ordering leisure and entertainment venues to close from 10 p.m. to 5 a.m. and limiting bars and restaurants to table service only. He also promised 2.7 billion pounds ($3.5 billion) to support the National Health Service this winter. The British government previously reimposed limits on public gatherings after infection rates rose to levels not seen since late May.

During a Senate committee hearing, Dr. Robert Redfield said a face mask may provide better protection against coronavirus than a vaccine. CNN's Elizabeth Cohen reports the CDC director also offered a timeline as to when a vaccine might be available to most Americans.