COVID-19 and RSV can cause many of the same symptoms, making it tricky to tell them apart. Both viruses spread through respiratory droplets and close contact and can cause cough, fever, congestion, fatigue, and sore throat. But despite these similarities, they’re caused by different viruses and can affect older adults in different ways.

If you have a cough that just won’t quit or other cold-like symptoms this fall, you may wonder whether you have COVID, RSV, or the flu, or even a common cold. Knowing the differences can help you understand when to get tested, when to seek medical care, and how to reduce your risk of serious illness through winter and beyond.

What is COVID-19?

COVID-19 is an infectious respiratory illness caused by the SARS-CoV-2 virus, which first appeared in late 2019 and has since circulated worldwide. It continues to evolve, with new variants emerging each year.

The virus that causes COVID spreads mainly through respiratory droplets—tiny particles released when someone coughs, sneezes, talks, or even breathes. You can also catch it by touching a contaminated surface (like a countertop) and then touching your mouth, nose, or eyes.

COVID symptoms vary widely. Some people have only mild, cold-like symptoms, while others develop severe respiratory problems.

Common symptoms include:

• Fever and/or chills
• Cough
• Sore throat
• Fatigue
• Body aches (including headache)
• Shortness of breath
• Loss of taste or smell
• Congestion or runny nose
• Nausea, vomiting, diarrhea

Mary K., a nurse, noted that COVID impacts everyone differently. Sharing her story with RWJBarnabas Health, she explained, "I never had a cough, but the tipping point for me came when I was terribly weak and debilitated with vomiting, diarrhea, and constant fever. When I finally went to Newark Beth Israel, my oxygen was very low and my lungs were inflamed. They admitted me, and I stayed in the hospital for six days; I was on oxygen the whole time."

Older adults and people with chronic health conditions (e.g., heart disease, diabetes, or lung disease) continue to be at higher risk for serious COVID complications. These can include acute respiratory failure; acute liver, kidney, or heart injury; pneumonia; blood clots; and chronic fatigue. Some people experience lingering symptoms that last for weeks, months, or even years. This is known as long COVID. About 1 in 6 people who get COVID-19 develop long COVID, and nearly 90% continue to experience ongoing health problems, according to a new study.¹

What is respiratory syncytial virus (RSV)?

Respiratory syncytial virus (RSV) is another common virus that infects the lungs and airways. Most people are exposed in childhood, but you can get it later in life, too. As many as 180,000 older Americans are hospitalized for RSV each year², and roughly 10,000 lose their lives due to RSV complications.³

In the Mayo Clinic Connect forum, one user shared their harrowing story: "RSV really did me in—almost as bad as when I got COVID three years ago. I was also shocked. As an ER RN, I've seen it in pediatrics but never in an adult until this year. It took four weeks to start to feel better, then another two to very slowly increase my activity to avoid those post-exertional crashes.”

RSV spreads the same way as COVID, through droplets and close contact.

Symptoms of RSV usually start out mild, resembling a cold:

• Runny or stuffy nose
• Cough
• Sore throat
• Mild fever
• Fatigue
• Loss of appetite

For most adults, RSV resolves within a week or two. But for older adults and people with chronic heart or lung disease, it can lead to more serious issues like pneumonia and bronchiolitis. RSV can also worsen existing conditions like chronic obstructive pulmonary disease (COPD) or congestive heart failure.

Every year, RSV sends tens of thousands of older Americans to the hospital. Yet because its symptoms mimic a cold or COVID, many people don’t realize what they have.

What are the main differences between COVID and RSV?

Here’s a quick comparison of the two viruses and how they differ:

One important difference is that COVID-19 can cause more whole-body symptoms, such as fatigue and muscle aches, while RSV more often causes symptoms affecting the lungs and airways.

Can you tell if you have COVID or RSV?

Unfortunately, there’s no way to know for sure based on symptoms alone. Even health care providers can’t always tell the difference without testing.

Many clinics and pharmacies now offer combination tests that check for COVID, RSV, and flu at the same time using a single nasal swab. If you feel under the weather and you’re not sure what’s causing it, testing can eliminate guesswork and allow you to take the right steps to feel better.

Testing early matters. Some treatments, like antivirals for COVID, work best within the first five days of symptoms. Knowing your diagnosis quickly also helps you take steps to avoid spreading the virus to others.

What is the treatment for COVID?

Treatment for COVID-19 depends on how sick you are and your risk of developing severe illness. In general:

• If you test positive, talk to your health care provider right away. Antiviral medications like Paxlovid or Lagevrio can help you avoid severe illness and hospitalization. But they must be started early to be effective.
• Rest up and drink plenty of fluids. If you find it necessary, take over-the-counter medications (e.g., ibuprofen, acetaminophen) to reduce your fever or relieve congestion.
• If symptoms worsen, get immediate medical help. For example, you have difficulty breathing, persistent chest pain, or confusion.

What is the treatment for RSV?

Treatment for RSV focuses on relieving symptoms, since there is no specific antiviral treatment for most adults. In general:

• Most cases of RSV can be managed at home with rest, fluids, and OTC medications. A small humidifier can help ease coughing and congestion.
• Since RSV is a virus, antibiotics won’t help unless a bacterial infection (e.g., pneumonia) develops as a complication.
• Give your doctor a call if symptoms last more than a week or suddenly get worse. You may need a hospital visit to get IV fluids or supplemental oxygen. It’s particularly important to monitor your RSV symptoms if you have a chronic heart or lung condition.

While both COVID and RSV can pose a danger to older people, early care and monitoring can make a big difference in symptoms and recovery.

How do I protect myself against COVID and RSV?

Vaccination against COVID and RSV is a simple but powerful way to reduce your risk of severe illness, hospitalization, and death from these dangerous respiratory viruses. This is especially true if you're over 60 or you have an underlying chronic health condition.

• COVID: An updated 2025-2026 COVID vaccine is available to protect against current variants. COVID vaccination for anyone age 6 months+ is considered a personal decision to be made with a health care provider. NCOA recommends the COVID shot for older adults as a safe, effective way to protect health and independence.
• RSV: The Centers for Disease Control and Prevention (CDC) recommends a single-dose RSV vaccine for all adults age 75+ and adults age 50-74 who have risk factors for severe RSV. The RSV shot is not an annual one; if you’ve already received yours, you don’t need to get another one for the time being.
• Flu: A flu shot each year adds another layer of protection, and you can often get all three vaccines (COVID, RSV, flu) at the same visit. CDC recommends a single-dose flu vaccine for children, pregnant women, and adults.

All three vaccines are 100% covered by Medicare in 2026, meaning you should pay no out-of-pocket costs when you receive your shot.  

Make these healthy habits part of your routine:

• Wash your hands often (with soap and water for at least 20 seconds), especially before eating or touching your face.
• Keep your distance from people who are sick as much as possible.
• Consider wearing a mask in crowded indoor settings during peak virus season (October through April).
• Keep your indoor air fresh and circulating freely by opening windows or using air purifiers.

How do I manage a respiratory illness at home?

If you come down with a respiratory illness, take it seriously—especially if you’re in a higher-risk group. Below are some tips:

1. Stay home and rest: Don’t ignore the signs and try to push through it. Your body needs energy to recover.
2. Call your health care provider: Let them know your symptoms and ask if they recommend testing or antiviral treatment.
3. Monitor your breathing: If you start to experience shortness of breath, chest pain, confusion, or a high fever, seek emergency care immediately.
4. Keep others safe: Cover your coughs and sneezes, wash your hands often, and avoid close contact until you’re feeling better. The people you care about will thank you for it.

Be proactive about your health

COVID and RSV overlap in many ways, but they’re not the same illness. COVID often causes whole-body symptoms and can lead to long-term effects (like long COVID). RSV mainly affects the lungs and airways, posing greater risks for older adults with heart or lung conditions.

That’s why prevention and early action are so important.

“You can take charge by staying current on your vaccines and practicing basic good hygiene, like wearing a mask in crowded spaces,” advised Dorothea Vafiadis, NCOA Senior Strategist for Healthy Aging. “And if you start feeling unwell, don’t wait—talk to your health care provider and get tested. A little knowledge and common sense can go a long way in keeping you and your household illness-free this season.”

Sources

1. CIDRAP. Long COVID may affect 1 in 6 infected patients. June 1, 2026. Found on the internet at https://www.cidrap.umn.edu/covid-19/long-covid-may-affect-1-6-infected-patients

2. Centers for Disease Control and Prevention (CDC). RSV in Older Adults and Adults with Chronic Medical Conditions. Found on the internet at https://www.cdc.gov/rsv/older-adults/

3. American Lung Association. RSV in Adults. Found on the internet at https://www.lung.org/lung-health-diseases/lung-disease-lookup/rsv/rsv-in-adults