PI ( Primary Immunodeficiency )
原發性免疫不全症
When people are born with a faulty immune system , they are said to have a Primary Immunodeficiency . PI diseases were o­nce thought to be rare , mostly because o­nly the more severe forms were recognized . Today physicians realize that PIs are not uncommon . They can occur in teenagers and adults as often as in infants and children . Because of advances in our medical understanding and treatment , individual who would not have survived childhood are now able to live normal lives .
出生時免疫系統不健全就是罹患了主要免疫系統不全症。主要免疫系統不全曾經被視為罕見疾病，主要是因為以往只能辨認比較嚴重的形態。今天醫療人員發現主要免疫系統不全症並不罕見。青少年和成人，兒童和嬰兒都有可能罹患。因為醫學知識和治療方法進步，原本活不過童年的患者，現在可以過正常生活。

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