Wheezing With Colds Raises Risk of Asthma
Rhinovirus-Related Wheeze Big Risk Factor in Kids
Oct. 1, 2008 -- Infants and toddlers who wheeze when they are sick with colds have a big risk of developing asthma later in childhood, a new study shows.
Wheezing with rhinovirus infection during the first three years of life was associated with a tenfold increase in asthma risk by age 6, researchers from the University of Wisconsin report.
Nearly 90% of the children in the study who wheezed with rhinovirus infection during their third year of life had a diagnosis of asthma three years later.
There are more than 100 identified rhinoviruses that are known to cause colds, but until now, these viruses have not been strongly associated with asthma risk, the study's principal investigator tells WebMD.
Instead, much attention has been focused on another common infectious agent, known as respiratory syncytial virus (RSV). Young children who are hospitalized with RSV infections have a high risk of developing asthma later in childhood.
"When we started this study we fully expected to find that RSV was the big culprit, but that is not what we found," says Robert F. Lemanske Jr., MD.
Colds, Wheezing, and Asthma
Wheezing occurs as a result of airway narrowing, and it is characterized by a whistling sound in the lungs during breathing.
As many as half of children will wheeze with respiratory illness at some point during their first three years of life, but many of them will not go on to develop asthma.
Early respiratory illness is a well-recognized risk factor for childhood asthma, but the impact of specific respiratory viruses on the airway disorder is not well understood.
In an effort to better understand the relationship between virus illness and childhood asthma, Lemanske and colleagues closely followed 259 children from birth through their sixth birthdays.
The children were considered at high risk for developing asthma because one or both parents had asthma or respiratory allergy.
By age 6, 28% of the children had been diagnosed with asthma.
Children who wheezed while sick with colds during the first year of life were three times more likely than children who did not wheeze while sick to develop the respiratory disease.