Bronchiolitis in Babies: Is It Contagious, How Serious Is It, and How Is It Treated?

It usually starts as nothing. A runny nose on Monday, a small cough by Tuesday, the sort of cold a parent barely mentions at daycare pickup. Then, around the third night, the sound changes. Breathing gets faster and shallower, there is a faint wheeze or crackle on each exhale, and the baby who normally drains a bottle in ten minutes gives up after two ounces.

That shift is the moment most families first hear the word bronchiolitis, often in an urgent-care hallway at 2 a.m. The word is unfamiliar, the baby looks miserable, and a quick internet search turns up headlines about a “deadly” respiratory virus. Fear fills the gap where information should be.

The honest picture is calmer than the headlines and more useful than the reassurance. Bronchiolitis is extraordinarily common, mostly self-limiting, occasionally serious, and almost never fatal in an otherwise healthy baby. What matters is knowing which night to watch closely and which signs mean it is time to stop watching and go.

What exactly is bronchiolitis, and why does it hit babies so hard?

Bronchiolitis is an infection of the bronchioles, the smallest branches of the airway tree, each narrower than a strand of spaghetti. A virus, most often respiratory syncytial virus (RSV), infects the lining of these tiny tubes. The lining swells, produces mucus, and sheds dead cells into the passage. In an adult, that debris is a nuisance. In a four-month-old whose bronchioles are already tiny, the same swelling can cut airflow dramatically, which is why babies wheeze, breathe fast, and tire out.

Size is the whole story. Airway resistance rises steeply as a tube narrows, so a millimeter of swelling that an older child would never notice can leave an infant working hard for every breath. Babies also breathe mainly through the nose, and a nose blocked with thick mucus makes feeding and breathing compete with each other.

Nearly every child catches RSV by age two, according to the CDC, and the NHS estimates that around 1 in 3 babies develops bronchiolitis during the first year of life. RSV is the usual culprit, but rhinovirus, human metapneumovirus, and several other common cold viruses can produce an identical illness. The virus matters less than the age of the patient: the same infection that gives a parent a scratchy throat gives their infant bronchiolitis.

It is worth separating the word from the fear attached to it. Bronchiolitis is a description of where the infection sits, not a verdict on how bad it will be. Most babies with bronchiolitis never see the inside of a hospital.

Can bronchiolitis kill you? What the numbers actually say

Yes, in rare cases, and the rarity deserves to be stated plainly rather than hidden behind cautious language. In the United States, the CDC estimates that RSV leads to roughly 58,000 to 80,000 hospitalizations each year among children under five, and an estimated 100 to 300 deaths in that age group. Set against the millions of RSV infections that occur every season, the death rate in this country is a small fraction of one percent, and the deaths cluster among premature infants, babies with heart or lung conditions, and those under a few months of age.

The NHS puts the hospital picture in similar terms: most cases of bronchiolitis are mild and clear up on their own, and only around 2 to 3 percent of babies with the illness need to be admitted. Among those admitted, the great majority go home within a few days after receiving oxygen or help with feeding.

Why, then, do headlines call RSV “deadly”? Partly because it is the leading cause of infant hospitalization in the US, which is a genuine public health burden. Partly because globally, in places without reliable oxygen and hospital care, the picture is far grimmer. In a country with accessible emergency care, the realistic danger is not that a healthy baby dies quietly at home, but that a struggling baby is not brought in soon enough.

That reframing matters. The question a worried parent is really asking is not “could this be fatal?” but “how will I know if my baby is in the small group that needs help?” The rest of this article is built around that second question.

Is bronchiolitis contagious, and how does it spread?

The infection is contagious in the same way a cold is contagious, because that is what it is: a cold virus behaving badly in a very small airway. The viruses that cause bronchiolitis travel in respiratory droplets when an infected person coughs or sneezes, and, just as often, on hands and surfaces.

The CDC notes that RSV can survive for many hours on hard surfaces such as tables and crib rails, and for shorter periods on soft surfaces like hands and tissues. A toddler touches a contaminated toy, rubs an eye, and the virus has a new home. An adult with a mild sniffle kisses the baby’s face and passes on far more than affection. Eyes, nose, and mouth are the entry points.

What surprises many parents is who does the spreading. Newborns rarely catch RSV from strangers. They catch it from a preschool-age sibling with a runny nose, a parent who feels “a bit off,” or a grandparent who assumed the cough was allergies. Older children and adults typically experience RSV as an ordinary cold, so they keep hugging, sharing spoons, and visiting.

The CDC gives the incubation period, the gap between exposure and first symptoms, as roughly four to six days. That lag is why a baby’s cough often appears a few days after a family gathering, long enough for nobody to connect the two.

Bronchiolitis itself is not passed from baby to baby as a diagnosis; the virus is. Whether the recipient develops bronchiolitis, a cold, or nothing noticeable depends mostly on age and immune experience.

How long is someone with bronchiolitis contagious?

People with RSV are usually contagious for three to eight days, and the CDC notes that some are infectious a day or two before symptoms appear. That pre-symptomatic window is inconvenient for families trying to protect a newborn, since a sibling can be spreading virus while still looking perfectly well.

Infants and people with weakened immune systems are the exception. The CDC reports that they can continue shedding virus for up to four weeks, even after they stop coughing. A baby who has recovered from bronchiolitis may therefore still pass RSV to a younger cousin weeks later. In practice this means good hand hygiene around young babies should continue well past the point when everyone feels better.

Parents often ask when their child can return to daycare. Most childcare settings and pediatric guidance focus on how the child is doing rather than a fixed day count: no fever, feeding and drinking normally, breathing comfortably, and well enough to take part. Because RSV is nearly universal in childcare settings during the season, exclusion until every trace of the cough disappears is neither realistic nor necessary. A lingering dry cough can last for weeks after the infectious period has ended.

The more useful question is about the household. If a newborn lives at home, the contagious sibling is the one to manage: separate towels, frequent handwashing, and no face-to-face contact with the baby while symptoms are active. For adults, the rule is simpler still. Anyone with a cold should not kiss a young infant’s face, however tempting the cheeks.

What are the first symptoms, and when do they peak?

Bronchiolitis almost always begins as an unremarkable cold. Over the first two or three days, expect a runny or blocked nose, a mild cough, sometimes a low fever, and a baby who is a little fussier and less hungry than usual. Nothing about this stage distinguishes it from any other winter virus.

The shift into bronchiolitis proper typically happens around day three, when the virus reaches the small airways. The cough becomes more persistent and often sounds wet or rattly. Breathing speeds up. Parents describe a wheeze, a whistling on breathing out, or a fine crackling sound. Feeding becomes effortful because the baby has to stop to breathe. Some infants develop a fever; many do not.

Both the NHS and Mayo Clinic describe symptoms as generally worst between days three and five. This is the stretch that lands families in emergency departments, and it is also, counterintuitively, the stretch parents should expect to be difficult. Knowing that the worst night is usually the third, fourth, or fifth helps in two ways: it stops a family from panicking when a mild cold suddenly seems to intensify, and it tells them exactly when to keep the closest watch.

After the peak, the trajectory is usually slow improvement rather than a sudden switch. Breathing settles first, appetite returns over several days, and the cough is the last to leave. The NHS notes that the cough can persist for a few weeks after the child otherwise feels well, which is normal and does not mean the infection has returned.

What are the signs that bronchiolitis is worsening?

Worsening bronchiolitis rarely announces itself with a dramatic new symptom. It shows up as more of what is already there: faster breathing, harder breathing, and less feeding. The trick is knowing what “more” looks like on a baby who cannot tell you.

Watch the chest and neck with the baby undressed. When breathing becomes labored, the skin between and below the ribs pulls inward with each breath, and the nostrils flare. Some babies grunt on each exhale or bob their heads. Feeding is the other sensitive gauge: a baby who is working to breathe will take less at each feed, and fewer wet diapers follow within hours.

What you see	Usually mild	Getting worse	Emergency
Breathing	Slightly fast, noisy nose	Fast and visibly effortful; ribs pulling in, nostrils flaring, grunting	Pauses in breathing, exhaustion, or very slow breaths
Color	Normal	Pale	Blue or gray lips, tongue, or skin
Feeding	Slightly less than usual	Less than half of normal intake; no wet diaper for 12 hours	Unable to feed at all
Behavior	Fussy but consolable, sleeping	Very irritable or unusually tired, hard to settle	Floppy, unresponsive, or cannot be woken

The middle column is where a same-day medical assessment is warranted; the right-hand column means emergency services now. The feeding thresholds come from NHS guidance: less than half the usual amount over the last two or three feeds, or a dry diaper for 12 hours or more, are both reasons to seek care. Trust the pattern, not a single moment. A baby who is steadily doing worse hour by hour needs to be seen, even if no single sign looks alarming yet.

When should you see a doctor or call emergency services?

Most babies with bronchiolitis can be cared for at home, but there are clear thresholds where professional assessment stops being optional. Get a same-day appointment or go to urgent care if your baby is taking less than half of their usual feeds, has not had a wet diaper for 12 hours or more, is breathing noticeably faster or with visible effort, seems unusually tired or irritable, or has a temperature of 100.4°F (38°C) or higher and is under three months old. Any baby under three months with a fever should be evaluated regardless of the cause, and any parent who simply feels something is wrong should act on that feeling.

Call emergency services immediately if your baby has pauses in breathing, is breathing very fast and struggling to the point of exhaustion, has lips, tongue, or skin that look blue or gray, is grunting with every breath, or is limp, floppy, or cannot be roused. Do not drive a baby who has stopped breathing normally; emergency crews can give oxygen on the way.

Between these two levels sits a gray zone that fills pediatric offices every winter, and that is entirely appropriate. Clinicians expect to see babies with bronchiolitis who turn out to be fine. A listen to the chest, a check of oxygen levels with a small sensor on the foot, and a look at how the baby feeds provide reassurance that no amount of online reading can. Guidance from Mayo Clinic and the NHS both stress that babies born prematurely, those under about 12 weeks, and those with heart or lung conditions should be seen earlier and with a lower threshold.

There is no penalty for being seen and sent home. The only costly mistake in bronchiolitis is waiting through a fourth night that should have been spent in an emergency department.

What's worse, bronchitis or bronchiolitis?

The two names differ by a few letters and a great deal of anatomy. Bronchitis is inflammation of the bronchi, the large airways that branch off the windpipe. Bronchiolitis is inflammation of the bronchioles, the fine tubes those bronchi divide into, deep in the lung. The suffix “-ole” simply means small.

Bronchitis is largely an illness of older children and adults. Acute bronchitis usually follows a cold, produces a nagging cough with mucus for a couple of weeks, and rarely requires more than rest and patience. Chronic bronchitis is a separate, long-term condition linked to smoking and lung disease. Bronchiolitis, by contrast, is almost exclusively an infant illness because only infant airways are small enough for the swelling to matter.

Which is worse depends on who is asking. For a healthy adult, neither is likely to be dangerous, and adults do not develop bronchiolitis in the childhood sense; the same virus just gives them bronchitis or a cold. For a baby under six months, bronchiolitis is the more concerning diagnosis, because it is the one that can compromise breathing and feeding enough to need hospital support. Acute bronchitis in a school-age child is usually more of a nuisance than a threat.

A practical rule: if the patient is under two and wheezing with fast breathing, bronchiolitis is the far more likely label, and the monitoring advice in this article applies. If the patient is older and has a productive cough without breathing difficulty, the clinician is more likely to call it bronchitis. Both are usually viral, and neither generally responds to antibiotics.

Can bronchiolitis turn into pneumonia?

It can, though less often than parents fear, and the distinction is blurrier than the two words suggest. Pneumonia means infection has reached the air sacs (alveoli) at the very ends of the airway tree, where oxygen crosses into the blood. Because bronchioles lead directly into alveoli, the same virus that inflames the tubes can inflame the sacs. The CDC describes RSV as the most common cause of both bronchiolitis and pneumonia in US children under one year old, which reflects how often the two overlap rather than one “turning into” the other.

Viral pneumonia in a baby with bronchiolitis often looks like a worse version of bronchiolitis: more effort to breathe, lower oxygen levels, higher fever, and a baby who is not turning the corner after day five. Clinicians usually do not need imaging to make a decision, because the treatment for viral pneumonia in an infant is the same supportive care: oxygen, fluids, and time.

A separate scenario is a secondary bacterial infection layered on top of the viral one. This is uncommon in bronchiolitis, but it is the situation where a clinician might reasonably consider antibiotics after weighing the whole picture. Signs that raise suspicion include a new or returning fever after the child had started to improve, a marked deterioration late in the illness, or a persistently high fever in a very unwell baby. That decision belongs to the treating team, guided by examination and sometimes blood tests or a chest X-ray.

The takeaway for parents is not to worry about the label but to watch the direction of travel. A baby who is improving, however slowly, after day five is doing what bronchiolitis does. A baby who was getting better and then gets worse again needs to be seen.

Which babies are at higher risk of severe bronchiolitis?

Age is the strongest predictor. Babies under about three months have the narrowest airways, the least reserve, and an immune system still learning its job. The NHS and Mayo Clinic both single out infants under 12 weeks as a group that should be assessed early. Premature birth compounds this: a baby born several weeks early has smaller, less mature lungs and often a smaller body to fuel the work of breathing.

Chronic conditions raise the stakes further. Babies with congenital heart disease, chronic lung disease of prematurity, neuromuscular conditions that weaken the muscles of breathing, or weakened immune systems are more likely to need hospital care and to stay longer. Mayo Clinic also lists exposure to tobacco smoke, never having been breastfed, and living in crowded conditions or attending childcare with many other children as factors that increase either the chance of infection or its severity.

Notice what is missing from that list. A healthy, full-term six-month-old who attends daycare is not in a high-risk category, even though the odds of catching RSV are very high. For that baby, bronchiolitis is overwhelmingly a miserable week rather than a dangerous one.

Risk factors change the threshold for seeking care, not the symptoms to watch for. A parent of a premature two-month-old should call the pediatrician at the first sign of a cold during virus season, before any wheeze appears, and should expect the clinician to want to see the baby. A parent of a robust ten-month-old can reasonably manage the early cold phase at home and escalate if breathing or feeding changes. Both approaches are correct for the child in question.

How is bronchiolitis treated at home?

There is no medicine that shortens bronchiolitis, and that fact, once accepted, is oddly freeing. Home care is about three things: keeping the baby hydrated, keeping the nose clear enough to feed and sleep, and watching for the signs that call for help.

Fluids come first. Offer breast milk or formula more often in smaller amounts, since a baby who tires quickly does better with frequent short feeds than with a few long ones. A baby who is breathing fast loses more water through the lungs, so the goal is simply to keep intake close to normal and diapers wet. Water or other drinks are not needed for babies under six months unless a clinician advises otherwise.

The nose is the bottleneck. A few drops of sterile saline in each nostril followed by gentle suction with a bulb syringe or nasal aspirator, done just before feeds and sleep, can transform a baby’s ability to eat. Saline is salt water, not a drug, and it works mechanically by loosening thick mucus. Avoid over-the-counter cough and cold medicines; the NHS and Mayo Clinic advise against them in young children because they do not help and can cause harm.

Keep the air smoke-free, absolutely and without exception. Sit the baby slightly more upright when awake and hold them upright after feeds, but always place them flat on their back to sleep; propping a sleeping infant is a suffocation risk that outweighs any benefit. If a fever is making the baby uncomfortable, ask your pediatrician which fever medicine is appropriate for your child’s age and weight rather than guessing from a box.

The final part of home treatment is a calm, watchful parent. Check breathing during the night, note feeds and diapers, and keep the thresholds from the earlier sections in mind.

What happens if a baby is admitted to hospital?

Hospital care for bronchiolitis is supportive, which is medical shorthand for helping the body do what it is already trying to do while the virus runs its course. Nobody will be prescribing a cure, and understanding this in advance prevents the sinking feeling some parents describe when they realize the team is “just watching.”

The two most common reasons for admission are low oxygen levels and inadequate feeding. Oxygen is delivered through soft prongs in the nose or a small mask. Some babies need warmed, humidified oxygen delivered at higher flow, which reduces the effort of breathing by keeping the small airways gently open between breaths. Nurses monitor oxygen saturation continuously with a sensor wrapped around a foot or hand.

If a baby cannot feed safely by mouth, a thin tube passed through the nose into the stomach allows breast milk or formula to be given without the baby having to coordinate sucking and breathing. Fluids through a vein are used when a baby cannot tolerate tube feeds. Suction of the nose before feeds continues on the ward as it does at home.

A small proportion of admitted infants, usually the youngest or those with underlying conditions, need intensive care for breathing support through a mask or a breathing tube. Even then, the goal is to buy time while the airways heal, and most of these babies recover fully.

Length of stay varies with age and severity, but the pattern is consistent: once a baby is feeding well and maintaining oxygen levels in room air, they go home, often still coughing. Parents are usually allowed to stay, to hold and feed the baby, and to see for themselves the moment the breathing eases.

Why don't antibiotics or inhalers usually help?

Parents reasonably expect a wheezing baby to be given something for the wheeze, and a coughing baby something for the cough. Bronchiolitis frustrates both expectations, and the reasons are worth understanding rather than merely accepting.

Antibiotics kill bacteria. Bronchiolitis is caused by viruses, which have no cell wall or metabolism for antibiotics to attack. Giving antibiotics to a baby with straightforward bronchiolitis exposes them to side effects and contributes to antibiotic resistance without touching the illness. The NHS, Mayo Clinic, and Cleveland Clinic all state that antibiotics are not effective against bronchiolitis. Clinicians reserve them for the uncommon case where a bacterial infection, such as a middle-ear infection or bacterial pneumonia, is also present.

Inhaled airway-opening medicines (bronchodilators) are the mainstay of asthma, so they seem like a natural fit for a wheezy infant. The difference is mechanism. Asthma wheeze comes from muscle tightening around the airways, which these medicines relax. Bronchiolitis wheeze comes from swelling and mucus inside airways that have very little muscle to relax. Large reviews have found that these medicines do not shorten illness or reduce hospital admissions in bronchiolitis, and pediatric guidelines in the US and UK advise against routine use. A clinician may still try one dose in an older infant to see whether there is any response, which is a judgment call for the treating team.

Steroid medicines, which reduce inflammation in asthma and croup, have been studied extensively in bronchiolitis and likewise are not recommended routinely because trials have not shown meaningful benefit. Cough medicines are unsafe in young children and do not work.

What is left is the humble toolkit: saline, suction, fluids, oxygen, and time. It is unglamorous, and it is what the evidence supports.

How long does bronchiolitis last, and does it come back or lead to asthma?

The NHS puts the typical course at two to three weeks from first sniffle to last cough, with the hardest days falling between days three and five. Breathing usually settles within a week, appetite recovers over the following days, and a dry cough often lingers longest. A cough that persists into a third or fourth week in a baby who is otherwise feeding, sleeping, and playing normally is part of the recovery, not a sign of failure.

Can it recur? A child can catch RSV more than once, and can develop bronchiolitis from a different virus, so a second episode in the same winter is possible. Repeat infections tend to be milder as the child grows and the airways widen. By the second birthday, most children who catch RSV get a cold rather than bronchiolitis.

The asthma question is the one parents most want answered, and the evidence gives a careful reply. Children who had bronchiolitis in infancy, especially severe bronchiolitis, are more likely to have episodes of wheezing with later colds through the preschool years, and studies show a higher rate of asthma diagnoses in this group. What researchers have not been able to settle is direction: whether bronchiolitis damages airways in a way that leads to asthma, or whether babies already prone to asthma are the ones most likely to develop severe bronchiolitis when RSV arrives. Both explanations probably contribute, and Mayo Clinic describes the link as an association whose cause remains unclear.

What that means in practice is modest. Most children who have had bronchiolitis do not develop asthma. A history of bronchiolitis is worth mentioning to your child’s clinician if recurrent wheeze appears later, because it is a useful piece of context, not a diagnosis waiting to happen.

How can families lower the risk during virus season?

RSV cannot be avoided entirely; nearly every child meets it by age two. The goal for families with a young baby is narrower and achievable: delay that first encounter past the most vulnerable months, and reduce the dose of virus when it does arrive.

Hand washing is the single most effective habit, because RSV moves on hands far more than through the air. Everyone who handles the baby should wash for at least 20 seconds with soap and water, particularly after coming home, after blowing a nose, and before feeds. Older siblings can be taught this as a game rather than a rule.

Keep anyone with cold symptoms away from the baby’s face. The CDC advises against kissing infants when you have symptoms and recommends covering coughs and sneezes with a tissue or sleeve, not a hand. A grandparent’s cold is the classic route of transmission precisely because it seems too mild to matter.

Clean the surfaces small hands touch most: toys, crib rails, high chair trays, doorknobs. RSV survives for hours on hard surfaces, so a wipe-down during the season is worthwhile, especially when a sibling is sick. Avoid sharing cups, spoons, and pacifiers between children.

Tobacco smoke, including on clothing and in the home after a cigarette outside, makes bronchiolitis more likely and more severe. A completely smoke-free environment is among the most protective things a household can offer. Breastfeeding, where possible, is associated with lower rates of severe RSV illness. Limiting time in crowded indoor spaces during the peak months of the season is sensible for babies under three months and for those born prematurely.

Finally, talk with your pediatrician before the season begins about what protective options are appropriate for your child’s age and health. That conversation belongs with a clinician who knows your baby’s history.

Frequently asked questions

Can bronchiolitis kill a baby?

Rarely, and almost never in an otherwise healthy, full-term infant who receives care when needed. The CDC estimates 100 to 300 RSV deaths a year in US children under five, against millions of infections. Deaths concentrate among premature babies, those under a few months old, and infants with heart, lung, or immune conditions. The realistic risk for most families is delay in seeking help, not the infection itself, which is why knowing the red flags matters more than the statistics.

What's worse, bronchitis or bronchiolitis?

For a baby, bronchiolitis is the more serious diagnosis because it affects the tiny bronchioles, where swelling can compromise breathing and feeding. Bronchitis involves the larger bronchi, occurs mainly in older children and adults, and usually amounts to a lingering cough. Adults do not get infant-style bronchiolitis; the same virus simply gives them a cold or bronchitis. Both are usually viral, and neither typically responds to antibiotics.

How long is someone with bronchiolitis contagious?

Usually three to eight days, and possibly a day or two before symptoms start, according to the CDC. Infants and people with weakened immune systems can keep spreading the virus for up to four weeks, even after the cough eases. Return to daycare is generally based on the child feeding well, having no fever, and breathing comfortably rather than on a fixed number of days, since a mild cough can linger for weeks.

What are the signs that bronchiolitis is worsening?

Faster breathing with visible effort is the key sign: skin pulling in between or under the ribs, flaring nostrils, grunting, or head bobbing. Feeding drops to less than half of normal and wet diapers become scarce. The baby may become pale, unusually tired, or very hard to settle. Blue or gray lips, pauses in breathing, or a floppy, unresponsive baby are emergencies that call for immediate help.

Can bronchiolitis turn into pneumonia?

It can, because the bronchioles open directly into the air sacs where pneumonia occurs, and the CDC lists RSV as the leading cause of both conditions in infants under one. Viral pneumonia usually looks like a worse version of bronchiolitis and is treated the same way, with oxygen and fluids. A new fever or sudden worsening after the baby had started improving may signal a secondary bacterial infection and should be assessed promptly.

How long does bronchiolitis last?

Most cases run two to three weeks in total, according to the NHS. The first two or three days resemble a cold, symptoms peak around days three to five, and breathing typically settles within about a week. Appetite recovers over the following days, and a dry cough is often the last symptom to disappear, sometimes persisting into the third or fourth week in an otherwise well child.

Do antibiotics help bronchiolitis?

No. Bronchiolitis is caused by viruses, and antibiotics act only on bacteria, so they neither shorten the illness nor prevent it from worsening. Major sources including the NHS, Mayo Clinic, and Cleveland Clinic advise against them for uncomplicated bronchiolitis. A clinician may prescribe antibiotics only if a separate bacterial infection, such as an ear infection or bacterial pneumonia, is also present, a judgment made on examination and sometimes tests.

Why isn't my baby given an inhaler for the wheeze?

Because the wheeze in bronchiolitis comes from swelling and mucus inside tiny airways, not from airway muscle tightening as in asthma. Inhaled airway-opening medicines relax that muscle, and large reviews have found they do not shorten bronchiolitis or reduce hospital stays. Pediatric guidelines in the US and UK therefore advise against routine use. A clinician might try a single dose in an older infant to check for response; that decision rests with the treating team.

Does bronchiolitis cause asthma later?

The evidence shows an association, not a proven cause. Children who had bronchiolitis in infancy, particularly severe cases, are more likely to wheeze with later colds and have higher rates of asthma diagnosis. Researchers have not determined whether the infection damages airways or whether babies already predisposed to asthma are the ones who get severe bronchiolitis. Most children who have had bronchiolitis never develop asthma.

Can adults catch bronchiolitis from a baby?

Adults catch the virus, not the infant illness. RSV and the other viruses behind bronchiolitis spread readily to adults, who typically experience a cold or, at most, bronchitis, because adult airways are wide enough that the swelling does not obstruct breathing. Older adults and people with heart, lung, or immune conditions can become more seriously ill from RSV, so handwashing protects the whole household, not only the baby.

References

• NHS – Bronchiolitis
• CDC – RSV in Infants and Young Children
• CDC – How RSV Spreads
• Cleveland Clinic – Bronchiolitis

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.