Could be because you were brought up in a too clean environment and also have a certain form of one gene;
Nature article.....
Stanford Report article....
Dr. Mordrid
The study hints at how exposure to the hepatitis A virus reduces the risk of developing allergies as much as fourfold. It finds that two-thirds of Caucasians carry a long version of the gene TIM-1 that renders them less likely to develop asthma and eczema after exposure to hepatitis A virus than people with the normal gene.
"The long version may help the virus enter the cell more efficiently," says Dale Umetsu from Stanford University in California, who led the study. This may alter the way the immune system responds to irritants such as pollen and dust.
"The long version may help the virus enter the cell more efficiently," says Dale Umetsu from Stanford University in California, who led the study. This may alter the way the immune system responds to irritants such as pollen and dust.
Stanford Report article....
Dr. Mordrid
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