Antibiotics are Not Good for Newborns">Antibiotics are Not Good for Newborns
Antibiotic use had a greater impact on children who would otherwise be considered at lower risk — children who lived in rural areas and those whose mothers did not have asthma — than on those who were already at increased risk because of an urban environment or genetic predisposition.
Studies of antibiotic use and asthma have been complicated. Because antibiotics are used to treat respiratory illnesses, which are often precursors of asthma, it has been difficult to determine the effect of antibiotics alone. But this study, of 13,116 Canadian children, found that the risk of asthma increased even in children treated with antibiotics for nonrespiratory illnesses in the first year of life. The study appears in the June issue of Chest.
Anita Kozyrskyj, the lead author and an associate professor of pharmacy at the University of Manitoba, said the findings supported what scientists call the microflora hypothesis — that “you need good bacteria in your digestive tract for normal development of the immune system so that you don’t end up with asthma,” as she put it.
The researchers tracked medications by examining prescription records, and determined asthma status by treatment for asthma or any asthma drug use in the year following the seventh birthday. Six percent of the children developed asthma by age 7.
After statistically adjusting for respiratory and nonrespiratory illnesses, sex, maternal history of asthma, urban or rural location and other factors, researchers found that one or two courses of antibiotics in the first year of life increased the risk of asthma by about 20 percent.
The more frequent the antibiotic use, the higher the risk. Three to four courses of medicine conferred a 30 percent added risk, and more than four courses of antibiotics increased the risk by almost 50 percent.
The findings were stronger for the use of broad-spectrum antibiotics like the cephalosporins and amoxicillin than they were for narrow-spectrum drugs like penicillin and erythromycin. “Lactobacilli, for example, are more affected by the broad-spectrum drugs,” Dr. Kozyrskyj said, referring to the beneficial bacteria contained in yogurt.
In a secondary finding using a small part of the sample population, researchers found that among children who had multiple courses of antibiotics in infancy, those who lived with no dog in the house had twice the risk of asthma compared with those who lived with one. The reasons are not clear, but it may be that having less contact with the germs that dogs carry results in lower microbial loads, making a child more sensitive to antibiotics. Dr. Kozyrskyj said in an interview that she found no decreased risk with the presence of cats or other pets.
Jeroen Douwes, a professor of epidemiology at Massey University in New Zealand who has published widely on asthma in children but was not involved in this work, cited the study’s strong methodology. “They had very good data on antibiotic use during the first year of life, and that’s actually quite rare,” he said. “They measured exposure before the disease occurred, while in most studies you have to rely on people’s recollections.”
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