Croup and RSV are viral respiratory illnesses in kids, but Croup affects the upper airway, causing a signature barking cough & seal-like sounds (stridor), worse at night, while RSV typically hits the lower lungs, leading to wheezing, congestion, & faster breathing, often more severe in babies under 1. A key difference: croup's cough is dry and barky; RSV's is wet and chesty, though RSV can sometimes cause croup.
However, there are key differences: Location of inflammation: Croup affects the upper airways (larynx and trachea), causing the characteristic barking cough and stridor. RSV primarily affects the lower airways (bronchioles), leading to wheezing and rapid breathing.
Croup and RSV can look similar and are both contagious, but the coughs sound different. An RSV cough is lower in the chest; and sounds wet, wheezy or rumbly. A croup cough is higher in the airway with a distinct barking, seal-like sound.
Sometimes croup can cause episodes of severe coughing followed by vomiting. The symptoms are almost always worse at night.
People who become infected with RSV show symptoms within four to six days after the virus enter the body. Initial signs of RSV are similar to mild cold symptoms, including sneezing, runny nose, fever, cough and decrease in appetite. Very young infants may be irritable, fatigued and have breathing difficulties.
Wet, Worsening Cough Infection in the airways may cause the lungs to produce more phlegm and mucus. With RSV, the cough is often a wet cough or a “productive” cough because it is helping clear the lungs of mucus.
Seek immediate medical attention if your child:
Take the child outside into cool, moist, night air. Encourage the child to drink lots of fluids. Treat a fever with acetaminophen or ibuprofen, as instructed by your child's provider. Engage the child in a calming activity to keep them as quiet and calm as possible, which will make it easier for them to breathe.
Conditions that can be mistaken for croup include:
Children with croup are usually diagnosed based on a clinical examination. Your physician may listen to your child's breathing with a stethoscope for wheezing and decreased breath sounds.
Viral infections often develop gradually, such as a cold that starts with a scratchy throat and progresses to a cough and congestion. Bacterial infections, however, tend to appear suddenly and with more intensity. For example, strep throat can cause a severe sore throat and high fever that comes on quickly.
Seek immediate medical attention if your child — or anyone at risk of severe RSV infection — has difficulty breathing, a high fever, or a blue color to the skin, particularly on the lips and in the nail beds.
It's usually mild, but it's important to call NHS 111 or see a GP if you think your child has croup. This is because they may need treatment.
Croup usually starts like a normal cold, with mild symptoms such as a fever, runny nose and cough. However, noisy breathing – known as 'stridor' – often develops suddenly during the evening or overnight because of the narrowing airway. It causes a squeaky and high-pitched sound when your child breathes in.
Croup is swelling around the vocal cords and windpipe that causes difficulty breathing and is accompanied by a “barking” cough. One of the most common causes of croup is a virus called parainfluenza.
Croup itself isn't contagious. But the viruses that cause it, including COVID, are very contagious. Experts estimate that you're more likely to spread these viruses during the first 3 days of your illness.
When to see the doctor for croup
You want to avoid Vicks and other camphor containing products in the humidifier, as this may irritate little lungs. My child always did well if I bundled her up and sat outside with her. The chilly air was soothing to her throat and helped her cough significantly, but the key is making sure they do not get cold.
To get rid of croup fast, focus on keeping the child calm, offering fluids, and using cool or moist air (like a steamy bathroom or cool night air), as crying worsens symptoms; for moderate cases, doctors use steroids or epinephrine, but always seek urgent care if breathing is difficult, as antibiotics don't work for this viral infection, says Nationwide Children's Hospital.
Croup is a respiratory infection, often caused by the parainfluenza virus. But unlike RSV which affects the middle part of the lungs, croup causes swelling in the upper airway.
Sleep. Children with croup should be allowed to rest as much as possible because this helps their body to fight the viral infection that is responsible for causing croup.
Signs of RSV typically peak on days three, four and five of illness. They may include: Runny nose. Coughing.
An at-home mail-order combination test is now available for RSV (respiratory syncytial virus), COVID-19, and the flu (influenza). There's no home self-testing option for RSV. You can order the combo test online without a prescription from a healthcare professional.
In fact, RSV sends many healthy, full-term infants to the hospital. However, RSV is especially dangerous for: Babies born early (premature birth). Infants, especially those 6 months or younger.