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."

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.

Doctors say RSV trends are returning to those seen pre-pandemic.

Some hospitals in the U.S. are seeing an increase in cases of RSV and so-called "walking pneumonia." Here's what you need to know.

A rise in rates of sudden unexpected infant deaths may have been linked to an off-season surge of RSV in 2021, according to a new study.

The vaccine is approved for at-risk adults in their fifties, making it the first shot approved for the age group.

ABC News chief medical correspondent Dr. Jen Ashton talks about promising data that shows an RSV vaccine can be used for younger adults with underlying medical conditions.

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.

Jordi Vilasuso's daughter Lucy was admitted to the NICU after her RSV diagnosis.

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

Despite this RSV season having a "game-changing" new set of vaccinations and immunizations, doctors say uptake has lagged among adults and children.

While the virus usually causes mild, cold-like symptoms, up to 80,000 children younger than 5 are hospitalized in the U.S. each year, according to the CDC.

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.

ABC News contributor Dr. Alok Patel talks about the rise of illnesses like COVID-19, RSV and the flu during the winter months and what you can do to protect yourself.

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.

Dr. Sean Cullen was 9 when his 9-month-old brother Kevin died due to RSV. Now, he works at the same neonatal intensive care unit where his brother was treated.

Health officials are reporting a rise in respiratory illnesses like RSV across the U.S.

With 31 states and Washington, D.C., experiencing "high" or "very high" level of activities, ABC News’ Dr. Jen Ashton shares what we should know.

At least 31 states report high or very high levels of COVID, RSV and flu.

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

A new study found hospital admission rates were higher for RSV than for the omicron strain or influenza A/B in children presenting at Swedish emergency departments

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.

Wisconsin officials confirmed the deaths of two children as the flu, RSV, and COVID-19 are at high levels in the state.

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.

The news comes as the CDC warns of increasing respiratory infections, including flu, COVID and RSV across the country.

COVID and flu hospitalizations are rising, CDC data shows.

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

Many hospitals across the country are reporting a shortage of pediatric beds after Thanksgiving, attributing it to a rise in RSV cases and other respiratory illnesses among children.

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

As the U.S. heads into colder weather months, when RSV cases tend to be higher, here's what you need to know about the virus including symptoms, treatments and vaccines.

New vaccines and shots are available for infants and some adults this year.

Some parts of China have been experiencing a surge of respiratory illnesses such as flu and RSV, in the first winter since the country eased its COVID-restrictions.

One of the most common types of respiratory viruses that circulates this time of year is called respiratory syncytial virus, or RSV.

Respiratory syncytial virus, or RSV, is one of the most common types of respiratory viruses that circulate this time of year.

As millions prepare to gather for Thanksgiving, and cases of respiratory viruses tick up across the U.S., experts reveal how to stay safe and healthy over the holidays.

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