Consistent with the «hygiene hypothesis,» which holds that increased microbial exposure in the first years of life is protective for asthma, the team's findings also indicate that the presence of
house dust components that stimulate the innate immune system decreases asthma risk.
The team analyzed the frequency of different types of immune cells in blood collected from 110 one year - old study participants, the presence of immune - stimulatory
components in the subjects»
house dust and asked whether any of the factors correlated with an increased of asthma at age seven.