Introduction 

Respiratory syncytial virus (RSV) is the most common virus that affects the respiratory system. It is often associated with infants and young children, but RSV can also infect adults.¹ 

Pneumonia, on the other hand, is a serious lung infection that can develop when the air sacs in the lungs fill with fluid or pus, causing symptoms like cough, fever, and difficulty in breathing. In this article, we explore whether RSV can cause pneumonia in adults, especially in those who are at a higher risk of developing severe illnesses.¹

Overview of RSV

RSV is one of the most common viruses of childhood, with symptoms that appear like a cold. It is highly contagious and affects infants. According to research, most children will have been infected by RSV at least once before the age of two.

RSV is similar to a cold virus but can cause more severe symptoms, especially in young children, older adults and adults with a higher risk of contracting the infection.²

Transmission and spread of RSV

RSV is spread through direct contact with infectious secretions or by inhaling droplets from coughs or sneezes. This makes it highly contagious in settings with close contact, like households, schools, and baby care facilities. Good hygiene practices, like frequent handwashing and avoiding contact with infected individuals, can help reduce the spread of RSV.

RSV can remain active for many hours on hard surfaces like tables and chairs. However, it usually lasts for shorter periods on soft surfaces such as tissues and hands. In most parts of the United States and regions with similar climates, the RSV season usually begins in the spring and reaches its peak in the winter. The exact timing and intensity of the RSV season can change from year to year in different areas.³

How does RSV affect adults?

RSV is not just a cause for concern in infants and young children. It can also significantly impact adults. While it often causes mild cold-like symptoms in healthy adults, it can lead to more serious health issues in certain groups of people.

Typical presentation in healthy adults

For most healthy adults, an RSV infection might feel like a common cold. Symptoms usually include:⁴

• Runny or stuffy nose
• Sore throat
• Mild cough
• Headache
• Fever
• Fatigue

These symptoms generally last about a week or two and resolve on their own without the need for medical treatment.

Who is the most vulnerable?

Certain groups of adults are at a higher risk of developing severe RSV infections. These include:^1,5

• Older adults: people aged 60 and older are more susceptible to serious RSV infections because their immune systems may have become weaker
• Adults with chronic health conditions: those with heart or lung diseases, like asthma, chronic obstructive pulmonary disease (COPD), or congestive heart failure, are at a greater risk. RSV can exacerbate pre-existing conditions and lead to complications
• Immunocompromised people: adults with weakened immune systems, whether due to conditions like HIV/AIDS, cancer treatments, or organ transplants, are more vulnerable to severe RSV infections 

RSV-related complications in adults

In these high-risk groups, RSV can lead to more serious health problems, such as:⁶

• Bronchitis: inflammation of the airways that can cause persistent coughing and breathing difficulties
• Pneumonia: a serious lung infection where the air sacs in the lungs fill with fluid or pus, which makes it hard to breathe
• Exacerbation of chronic conditions: RSV can worsen underlying chronic heart or lung conditions like asthma and congestive heart failure, leading to hospitalisations or may even cause death

RSV and pneumonia

RSV can sometimes cause pneumonia, especially in adults who are at higher risk. Pneumonia is a serious lung infection that makes it hard to breathe and can lead to other health problems.

How can RSV cause pneumonia?

RSV infects the respiratory system, starting with the nose and throat, which is the upper respiratory tract. In some cases, the virus can travel down into the lungs and cause inflammation. When the air sacs in the lungs (alveoli) fill with fluid or pus, it results in pneumonia. This makes it difficult for the lungs to transfer oxygen to the blood, causing breathing problems.^7,9

Symptoms and diagnosis

Symptoms of RSV-induced pneumonia in adults

When adults develop pneumonia due to RSV, they might experience more severe symptoms compared to a regular cold. These symptoms can include:^8,9

• High fever: a rise in body temperature
• Severe cough: persistent coughing that produces mucus
• Shortness of breath: difficulty breathing or feeling breathless
• Chest pain: pain or discomfort in the chest, especially when breathing or coughing
• Fatigue: feeling extremely tired and weak
• Wheezing: a whistling sound while breathing

Diagnostic methods

• Chest X-rays: These images help doctors see if there is an infection in the lungs
• Blood tests: These tests check for signs of infection and the body’s immune response
• Sputum tests: The mucus you cough up is examined to detect the presence of RSV or other pathogens
• Nasopharyngeal swab: A sample taken from the nose or throat to test specifically for RSV

Differentiating RSV pneumonia from other types of pneumonia

• Patient history: Information about recent illnesses, exposure to others with RSV, and existing health conditions
• Symptom patterns: While RSV pneumonia shares common symptoms with other types of pneumonia, a history of cold-like symptoms that worsen can point towards RSV
• Test results: Specific tests for RSV, like the nasopharyngeal swab, help confirm if RSV is the cause
• Severity and progression: RSV pneumonia may show a rapid progression in high-risk adults, and the combination of symptoms and test results helps differentiate it from bacterial pneumonia or pneumonia caused by other viruses

Treatment and management

• Antibiotics: These are not effective against RSV itself since it is a virus, but the doctors might prescribe them if there's a bacterial infection along with the RSV
• Antiviral medications: In some cases, doctors might prescribe antiviral medications to help fight the RSV virus directly
• Oxygen therapy: For those having trouble breathing, extra oxygen might be provided to ensure the body gets enough oxygen
• Pain and fever relievers: Medications are prescribed to help reduce fever and relieve pain
• Fluids: Staying well-hydrated is important, so patients are encouraged to drink plenty of fluids

Supportive care at home

• Rest: Getting plenty of rest helps the body fight off the infection
• Hydration: Drinking lots of fluids like water, herbal teas, and clear broths helps keep mucus thin and easier to cough up
• Humidifier: Using a humidifier can keep the air moist, which can help ease coughing and congestion.
• Over-the-counter medications: Medicines available without a prescription can help manage symptoms like cough, congestion, and fever

Prevention

• Good hygiene: regular hand washing with soap and water, especially after being in public places, can help reduce the risk of catching RSV
• Avoiding sick people: try to stay away from people who are showing symptoms of a cold or flu
• Disinfecting surfaces: regularly clean and disinfect surfaces that are frequently touched, like doorknobs, light switches, and phones
• Healthy lifestyle: maintaining a healthy lifestyle with a balanced diet, regular exercise, and sufficient sleep helps strengthen the immune system

Vaccination developments and recommendations

• Adults aged 60 years and above: FDA has approved two RSV vaccines (GSK Arexvy and Pfizer Abrysvo) for this age group
• Pregnant women: Pfizer Abrysvo vaccine is licensed and advised for use between the 32nd and 36th weeks of pregnancy to safeguard infants
• Infants and some young children: an approved RSV preventive antibody is recommended for use in infants and certain young children

FAQs

Can RSV cause pneumonia in adults?

Yes, RSV can cause pneumonia in adults, especially in those who are older, have chronic health conditions,  or have weakened immune systems.

Who is most at risk for RSV-induced pneumonia?

Older adults, individuals with chronic lung or heart conditions, and those with weakened immune systems are most at risk for developing pneumonia from RSV.

What are the symptoms of RSV-induced pneumonia in adults?

Symptoms include high fever, severe cough, shortness of breath, chest pain, fatigue, and wheezing. These symptoms are more severe than those of a common cold.

How is RSV-induced pneumonia diagnosed?

Doctors diagnose it using chest X-rays, blood tests, sputum tests, and sometimes a nasopharyngeal swab to test specifically for RSV.

What treatments are available for adults with RSV-induced pneumonia?

Treatment may include antiviral medications, oxygen therapy, fluids, pain and fever relievers, and supportive care at home, such as rest and hydration.

Is there a vaccine for RSV for adults?

Yes, two RSV vaccines (GSK Arexvy and Pfizer Abrysvo) are approved for adults aged 60 and above.

Summary

RSV (Respiratory syncytial virus) can cause pneumonia in adults, especially in those who are older, have chronic health conditions, or have weakened immune systems. It can cause symptoms including high fever, severe cough, shortness of breath, chest pain, fatigue, and wheezing, which can be more severe than a common cold. Diagnosis is done by running tests like chest X-rays, blood tests, and sometimes a nasopharyngeal swab to specifically test for RSV. 

Usually, treatment includes antiviral medications, oxygen therapy, fluids, and supportive care at home. Preventive measures such as good hygiene, avoiding sick people, disinfecting surfaces, and maintaining a healthy lifestyle can be taken to avoid contracting the virus. Vaccines are available for adults who are 60 and older, as recommended by the CDC. RSV-induced pneumonia can be serious and requires prompt medical attention to manage symptoms and prevent complications.