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Some cases of lower respiratory infections have also been described in children (6). After adjusting for confounding by lower respiratory infection status and race/ethnicity, endotoxin exposure was found to be significantly associated with a nearly 6-fold increase in prevalence of wheeze for a one interquartile range increase in airborne endotoxin (95% confidence interval, 1. However, several studies show that moderate physical activity may improve the immune system and reduce the risk of both upper and lower respiratory infection. |
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