Scientists in Canada have suggested through a new study that clean drinking water can increase risk of childhood asthma.
According to University of British Columbia in Canada, there is a possible link between the risk of asthma and the cleanliness of the environment. Microbiologists at the University have found a yeast in the gut of new babies in Ecuador that appears to be a strong predictor that they will develop asthma in childhood.
Researchers previously identified four gut bacteria in Canadian children that, if present in the first 100 days of life, seem to prevent asthma. In a followup to this study, researchers at the University repeated the experiment using fecal samples and health information from 100 children in a rural village in Ecuador. Canada and Ecuador both have high rates of asthma with about 10 per cent of the population suffering from the disease.
The team found that while gut bacteria play a role in preventing asthma in Ecuador, it was the presence of a microscopic fungus or yeast known as Pichia that was more strongly linked to asthma. Instead of helping to prevent asthma, however, the presence of Pichia in those early days puts children at risk.
The team suggests there could be a link between the risk of asthma and the cleanliness of the environment for Ecuadorian children. As part of the study, the researchers noted whether children had access to clean water.
“Those that had access to good, clean water had much higher asthma rates and we think it is because they were deprived of the beneficial microbes,” said Brett Finlay, a microbiologist at UBC. “That was a surprise because we tend to think that clean is good but we realize that we actually need some dirt in the world to help protect you.”
Now Finlay’s colleagues will re-examine the Canadian samples and look for the presence of yeast in the gut of infants. This technology was not available to the researchers when they conducted their initial study.