New Research Links RSV to Increased Heart Risks in Adults

RSV is often thought of as a seasonal virus that mainly affects babies and young children. But growing research is showing that RSV can also have serious health implications for adults — particularly when it comes to heart health.

Recent studies suggest that adults who experience an RSV infection may face a higher risk of heart-related complications in the months that follow, even after respiratory symptoms have improved. This has prompted health experts to look more closely at RSV not just as a lung infection, but as a virus that can place added strain on the body as a whole.

Understanding these findings is important, especially for older adults and people with existing health conditions. This article takes a closer look at what RSV is, common symptoms to watch for, and what new research is revealing about the potential long-term heart risks linked to RSV infection.

What is RSV?

Respiratory syncytial virus, commonly known as RSV, is a highly contagious virus that affects the respiratory tract. It spreads easily through coughs and sneezes, close contact, and by touching contaminated surfaces.

While RSV is best known for causing illness in infants and young children, it can infect people of all ages. In adults, RSV is often mistaken for a common cold, which means it can go undiagnosed or underestimated — especially when symptoms are mild at first. It can lead to more serious complications in some people, including pneumonia or hospitalisation. 

Read related article: RSV vs. COVID-19 vs. Influenza: All You Need to Know

RSV typically circulates during the cooler months in Australia, however, RSV isn’t limited to a single season. Infections can still occur outside the usual peak period, particularly when people are exposed to travellers arriving from countries with colder climates or different RSV seasons. This means RSV can circulate year-round, especially in communities with frequent travel or close contact settings.

Common symptoms of RSV

RSV symptoms can range from mild to more severe, and they often start gradually. In many adults, RSV may feel similar to a common cold at first, which is why it can be easy to overlook.

Common symptoms include:

• Runny or blocked nose
  

• Cough
  

• Sore throat
  

• Fever
  

• Fatigue or feeling run down
  

• Headache

In some cases, symptoms can worsen, particularly in older adults or people with underlying health conditions. More serious symptoms may include:

• Wheezing
  

• Shortness of breath
  

• Chest discomfort
  

• Persistent or worsening cough

Severe RSV infection can lead to complications such as bronchitis or pneumonia, which may require medical attention or hospitalisation. Importantly, symptoms don’t always reflect how the body is responding internally — some people may feel “mildly unwell” while still experiencing significant inflammation or stress on the body.

If symptoms feel unusual, severe, or don’t improve over time, it’s important to seek medical advice.

What the new research found about RSV and heart risk

A major 2025 study published in JAMA Network Open has added new urgency to how we think about RSV in adults — especially older adults and those with existing health conditions.

Where the study came from

The research was led by Danish epidemiologists and cardiologists and used Denmark’s national health registries, which track laboratory test results, hospital admissions, diagnoses, and outcomes across the entire population.

What the study looked at

Researchers followed more than 17,000 adults aged 45 and over, comparing:

• People with laboratory-confirmed RSV infection, and
  

• Matched individuals of the same age, sex, and health background without RSV

Participants were tracked for up to one year after infection to see whether they experienced cardiovascular events such as:

• Heart attack (ischaemic heart disease)
  

• Stroke
  

• Heart failure
  

• Arrhythmias (irregular heart rhythms)
  

• Blood clots (venous thromboembolism)
  

• Inflammatory heart conditions

The key findings

Over the 12 months following infection, adults who had RSV experienced significantly more heart-related events than those who did not.

At one year:

• There were 4.7 additional cardiovascular events per 100 people who had RSV
  

• The risk was highest in people who were hospitalised, older adults (especially those over 75), and people with existing heart disease or diabetes
  

• The increased heart risk after RSV was comparable to influenza, a virus already well known to strain the heart

Importantly, the risk did not stop after the acute illness. While many events occurred in the first 30 days, the cumulative burden continued to build over the entire year, showing that RSV can have long-lasting effects beyond the lungs.

Why a respiratory virus can affect the heart

It might seem surprising that a virus that mainly affects the lungs could also increase the risk of heart problems. When the body fights a viral infection, it triggers inflammation as part of the immune response. In some people, this inflammation doesn’t stay limited to the lungs. It can affect blood vessels, increase clotting risk, and place extra strain on the heart as it works harder to deliver oxygen around the body.

RSV infection can also:

• increase heart rate and blood pressure during illness
  

• worsen existing heart conditions
  

• reduce oxygen levels, forcing the heart to work harder
  

• trigger inflammatory responses that persist after symptoms improve

For people who already have cardiovascular disease, diabetes, or weakened immune systems, this added strain can increase the likelihood of events such as heart attack, stroke, or heart failure — particularly in the months following infection.

This pattern isn’t unique to RSV. Similar links between viral infections, inflammation, and heart complications have been observed with influenza and COVID-19. What’s new is the growing evidence that RSV may carry a comparable long-term cardiovascular burden, reinforcing the need to take RSV seriously in adults — not just children.

Why prevention still matters

Even though many people recover from RSV without serious issues, growing evidence shows that prevention remains important — especially for protecting those who may be more vulnerable to complications.

RSV spreads easily through close contact, respiratory droplets, and contaminated surfaces. People can also be infectious before symptoms peak and even after they start to improve, which makes unintentional spread more likely.

Simple prevention steps can make a meaningful difference:

• Stay home when unwell, even if symptoms feel mild
  

• Practise good hand hygiene, especially after coughing or sneezing
  

• Cover coughs and sneezes and dispose of tissues promptly
  

• Consider wearing a mask when sick or when visiting high-risk settings
  

• Avoid close contact with older adults or people with chronic conditions when you’re unwell
  

• Vaccination, where eligible, may help reduce the risk of severe illness

These actions don’t just protect the individual — they help reduce the spread of RSV within families, workplaces, aged care settings, and the wider community.

Conclusion: Looking after your health and others

RSV has long been seen as a seasonal respiratory illness, particularly affecting babies and young children. However, emerging research is reshaping that understanding. New studies suggest that RSV infection in adults may be linked to an increased risk of heart-related complications in the months that follow — especially for older adults and those with underlying health conditions.

While most people recover fully, these findings highlight why RSV should not be dismissed as “just a cold.” Awareness, early care, and simple prevention measures can play an important role in reducing both immediate illness and potential long-term health impacts.

As research continues to evolve, staying informed and taking sensible precautions helps protect not only individuals but also the wider community — particularly those most at risk.

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