prev next front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |28 |29 |30 |review
This evidence has given rise to the “hygiene hypothesis” which argues that increases in asthma prevalence are due to changes in immune function, because our cleaner environment means that we have lost the previous protective effect of infant infections.