The paper was retracted from its journal due to ethical and methodological issues.

A new study published this week found severe COVID-19 infections from the first wave of the pandemic could double the risk of heart attack and stroke.

Former President Trump is disputing a report that, during the COVID-19 pandemic, he secretly sent Vladimir Putin a COVID-19 testing kit for his personal use.

The FDA has authorized the first over-the-counter combination COVID-19 and flu test outside of emergency use, which delivers results at home in about 15 minutes.

The latest evidence that the pandemic, far from creating a country of couch potatoes, actually woke America from its entrepreneurial slumber.

Starting Thursday, Americans can order four free at-home COVID tests from the federal government ahead of respiratory virus season.

Americans can order free tests for the third year in a row ahead of the upcoming respiratory virus season.

The findings show that teenage girls were more affected than teenage boys, potentially impacting their mental health and even their behavior.

Former New York Gov. Andrew Cuomo began his public testimony before Congress on his COVID-19 nursing home policies on Tuesday.

Former New York Gov. Andrew Cuomo began his public testimony before Congress on his COVID-19 nursing home policies on Tuesday.

Updated COVID-19 vaccines are arriving for the fall and winter season. Experts say you should get vaccinated, but you may not need to rush to receive the shot.

A recent study on semaglutide, the active ingredient in popular weight loss drugs like Ozempic and Wegovy, found that it may reduce the risk of COVID-related deaths.

A new study published in the Journal of the American College of Cardiology found that people taking Wegovy during the COVID pandemic were less likely to die from the virus.

More than four years after the start of the COVID-19 pandemic, some immunocompromised and disabled Americans have changed their way of living completely to survive.

New data from the CDC shows that COVID levels are on the rise across the nation. ABC News' medical correspondent Dr. Darien Sutton reports.

Families will be able to order up to four free tests as the FDA authorizes updated COVID vaccines.

The U.S. government is restarting the free at-home COVID tests program this month as federal officials prepare for the upcoming fall and winter respiratory virus season.

The FDA approved and granted emergency use authorization Thursday for updated COVID-19 vaccines for the upcoming fall and winter season.

The study, published Wednesday in the journal JAMA, shows children with long COVID may show different symptoms depending on their age.

A new study from NYU Langone found that children and teens with long COVID may experience different symptoms depending on their age.

At least 40 athletes tested positive for COVID at the Summer Olympic Games in Paris, according to the WHO. Experts say the Games are actually a COVID "success" story.

Athletes who tested positive had to follow certain protocols in order to compete.

A new NIH-supported study found that routine blood tests were not reliable to diagnose long COVID due to a lack of differences in blood biomarkers.

ABC News medical contributor Dr. Alok Patel joins to talk about what is driving this summer’s COVID-19 surge.

More than half of U.S. states are reporting 'very high' levels of COVID activity, according to wastewater data from the Centers for Disease Control and Prevention.

As students get ready to head back to class across the U.S. -- and COVID-19 cases keep trending upward -- are schools ready to handle the virus?

Since spring, COVID-19 test positivity has steadily climbed, yet hospitalizations and deaths remain at low levels, according to the Centers for Disease Control and Prevention.

Dozens of athletes have contracted the virus while competing in Paris.

Noah Lyles’ exuberant walkout for the 200-meter final gave little indication he was among the dozens who have tested positive for COVID or other respiratory illnesses.

American sprinter Noah Lyles collapsed after winning the bronze medal in the 200-meter race, with medical staff rushing to his side. Lyles confirmed he had COVID-19 but decided to run anyway.

A new CDC report found that COVID-19 is now the 10th leading cause of death in 2023, down from the 4th leading cause of death in 2022.

Those opposing the bill say it threatens protesters from expressing their views anonymously and poses a health risk with COVID-19 on the rise.

As Tim Walz joins Kamala Harris on the Democratic presidential ticket, critics are blasting the governor for how he handled a massive COVID-19 fraud scheme in his state.

President Joe Biden will end his COVID isolation in Rehoboth Beach, Delaware, and is expected to return to the White House Tuesday afternoon.

ABC News' medical correspondent Dr. Darien Sutton breaks down the latest medical news, including two studies on pregnancy making headlines.

The White House said it will provide regular updates on the president's status "as he continues to carry out the full duties of the office while in isolation."

Vice President Kamala Harris said, "You cannot claim you stand for unity if you are pushing an agenda that deprives Americans of rights."

ABC News medical contributor Dr. Jessica Shepard shares a new study that found no increased risk of major birth defects attributed to a first-trimester COVID infection or vaccination.

President Joe Biden has put his campaign on hold after his diagnosis and amid heightened concerns around his health, with a growing number of Democrats urging him to step aside as the party nominee.

Amid an expected "bump" in summer COVID-19 cases, data indicates the southern and western U.S. are seeing the largest increases.

Colorado Governor Jared Polis appeared on ABC's "This Week" Sunday.

Emhoff was at the White House a few days ago to celebrate Independence Day with Harris, President Joe Biden and first lady Jill Biden.

Second gentleman Doug Emhoff is asymptomatic and continuing to work remotely, his office said.

Diamond 'Blue' Smith exclusively speaks out about his 12-month prison sentence after pleading guilty to conspiracy to commit wire fraud connected to covid relief loans.

Experts are looking into possible learning delays in babies and toddlers.

This week, the National Institutes of Health began testing an experimental COVID-19 vaccine.

A NIH-sponsored clinical trial has begun testing a nasal COVID-19 vaccine. Here's what you need to know about the possible next generation of shots.

The dean of the Brown University School of Public Health shares what to know to stay safe amid a summer wave of COVID-19 cases and the new strain circulating.

Dr. Anthony Fauci said he never considered resigning, despite death threats and backlash from White House advisers over his handling of the pandemic.