An Ohio father is speaking out after his 4-year-old daughter developed severe complications from the flu, including a severe brain injury.

ABC News’ Becky Worley shares expert-backed tips to help prevent illness before it starts.

Locklynn Boler, 4, from Ohio, tested positive for the flu, and just days later was hospitalized and suffering with brain damage.

Becky Worley looks into how at-home testing may help diagnose flu without a doctor’s visit.

An FDA vaccine advisory committee meeting to discuss next season’s flu vaccine has been canceled, potentially delaying the delivery schedule.

Erielle Reshef shares the latest on the recent spike in flu cases.

The CDC says flu activity is elevated nationwide as this is now classified as a high severity flu season.  

ABC News’ Medical Correspondent Dr. Darien Sutton breaks down the top medical headlines happening in the U.S. and how to stay healthy.

Flu activity remains "elevated" in the U.S. but is starting to show signs of abating, according to new CDC data published Friday.

A look at the numbers behind peak flu season during the month of February, as the CDC estimates there have been nearly 29 million cases in the U.S. since the fall.

ABC News medical correspondent Dr. Darien Sutton answers your health questions and shares what you need to know about how to safely consume supplements.

ABC News medical correspondent Dr. Darien Sutton answers your health questions and shares tips for helping your child take medicine. 

The rate of Americans visiting doctors’ offices for flu-like illness is continuing to reach record levels, new CDC data published on Friday shows.

ABC News' Reena Roy reports on the increasing flu figures and what Americans can do to stay healthy.

CDC data shows that people are seeking medical care for flu-like symptoms at the highest rates since 2009 during the swine flu outbreak.

Dr. Jessica Shepherd, chief medical officer of hers, joins ABC News Live to discuss the latest flu surge.

The CDC says that doctor’s visits for flu illnesses are at their highest in 15 years. Emergency medicine physician Dr. Stephanie Widmer shares tips on how to protect yourself.

Outpatient health care visits for flu-like illnesses are at their highest levels in 15 years, according to data updated Friday by the CDC.

A pediatric emergency medicine physician shares how to prepare for flu season with a "flu box" or "sick box."

There have also been about 190,000 hospitalizations and 8,300 deaths from flu across the country so far this season, according to the latest data from the Centers for Disease Control and Prevention.

Costco and manufacturer LNK International, Inc. are recalling some boxes of Kirkland Signature Severe Cold & Flu Plus Congestion caplets.

Respiratory viruses are continuing to spread across the United States and such activity "is expected to continue for several more weeks."

The U.S. is seeing a "quad-demic" as cases of COVID-19, flu, RSV and norovirus spread at the same time. Experts said this is what you need to know.

Four viruses are currently circulating in the United States, together earning the name "quad-demic."

ABC News medical correspondent Dr. Darien Sutton answers your health questions and shares how to make saline at home. 

The so-called "quad-demic" includes flu, COVID, RSV and norovirus, with ERs across the country seeing a surge of patients, according to health officials.

ABC News' Morgan Norwood brings the latest updates as even one state's hospitals are forced to restrict visitors.

Dr. Stephanie Widmer joins GMA to talk the infectious diseases hitting hard this season and how to stay healthy.

According to the CDC, cases of the cold, flu, COVID and RSV are rising and experts predict these numbers will continue to grow in the coming weeks.

Respiratory illness activity is currently considered "high" in the United States, according to the CDC. In one state, it is at a "very high" level.

Dr. Patel discusses the preventative measures you can take to protect yourself during cold and flu season.

ABC News’ Medical Correspondent Dr. Darien Sutton is here with what you need to know as the cold and flu season ramps up.

ABC News medical correspondent Dr. Darien Sutton discusses how to prepare at home for the upcoming cold and flu season.

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.

This year's flu vaccine reduced the risk of hospitalization in the Southern Hemisphere but wasn't as effective as the one used in the prior season, a new CDC study found.

There were 200 pediatric flu-related deaths in the 2023-2024 season, compared to the previous high of 199 during the 2019-2022 season.

Dr. Meghan Martin, a pediatric emergency physician, shares how parents can prepare for flu season by creating a "flu box."

ABC News medical correspondent Dr. Darien Sutton outlines four easy steps to prepare kids for a flu shot.

A Michigan farmworker who worked with cows has been diagnosed with bird flu, which is the second human case associated with an outbreak in U.S. dairy cows.

The Centers for Disease Control warns health care providers to look out for sick patients who may have had contact with birds or livestock.

April Nelson said the reunion between her children was "beautiful."

New CDC data updated Friday shows 25 states are experiencing ‘high’ or ‘very high’ levels of respiratory illness activity.

With many states reporting "very high" levels of flu, the CDC recommends staying up to date on vaccinations and taking preventative steps.

The agency says both flu and COVID hospitalizations have decreased over the last few weeks.

Twenty-three states are experiencing "high" or "very high" levels of respiratory illnesses, according to health officials.

The U.S. Centers for Disease Control and Prevention said the spread of respiratory illnesses appears to be slowing, for now.

At least 38 states have reported high or very high levels of respiratory illnesses.

At least 38 states are now showing "high" or "very high" cases of illness including, COVID-19, flu and RSV.

Data from the the Centers for Disease Control and Prevention shows respiratory illnesses are elevated in 38 states.

Some hospitals are returning to masking, given the rise of respiratory illnesses like COVID, RSV and the flu.