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.

In the winter months, it seems few are safe from some kind of illness — flu, COVID-19, norovirus, colds

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

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.

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

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.

New York City Health + Hospitals is bringing back indoor masking across its buildings in areas where patients are being cared for amid a rise in respiratory viruses.

COVID and flu cases have been rising across the United States.

Amid a rise in COVID and flu cases and hospitalizations, several hospitals across the U.S. are reinstating mask requirements for staff and visitors.

Some hospitals are bringing back masks, with 31 states and Washington, D.C., seeing high or very high levels of infection from flu, COVID, RSV and the common cold.

Across the country, health officials are seeing a rise in respiratory illnesses like RSV, COVID, the flu, and the common cold.

ABC News’ Dr. Darien Sutton provides an update on the increase in respiratory illnesses across the country.

ABC News’ Dr. Darien Sutton answers questions about the illnesses that continue to spread this holiday season.

23 states plus New York City and Washington DC are seeing high or very high levels of respiratory illnesses.

ABC News medical correspondent Dr. Darien Sutton breaks down a new study that showed how flu vaccines reduced the risk of hospitalization in infants younger than 6 months.

Seventeen states plus NYC are experiencing high levels of infection including RSV, COVID and flu.

Hospitals are seeing an increase in respiratory illnesses ahead of the holiday season, the Centers for Disease Control and Prevention said.

Health officials are urging eligible patients to be vaccinated for the flu, COVID, and RSV.

New CDC data updated on Friday shows COVID and flu hospitalizations continue to increase across the U.S. as the CDC director says she believes we've hit the peak of RSV.

Eleven states are now reporting “high” or “very high” levels of respiratory illnesses.

A new article suggests that your attitude, gut health and other factors have been shown to boost immune response. Dr. Jen Ashton explains.

Eleven states, plus New York and Puerto Rico, are experiencing high or very high levels of respiratory illness activity.

Experts continue to stress that current vaccination is one of the most important factors in reducing the spread of respiratory disease.

New data from the Centers for Disease Control and Prevention indicates that several states are grappling with elevated flu activity.