Kumar参加了一个由多个医院协作的研究项目，旨在找出其答案。初步结果显示，病症的严重性与HLA(人白细胞抗原系统，一种免疫系统内的基因变异)有关。
Kumar is coordinating a multi-hospital study of severe H1N1 to find out, but says preliminary results suggest severity is linked to HLA, a genetic variation in immune systems.
由于这种抗原很少出现，因此它不可能是由于人类血液中遗传变异形成的抗原。
Since it occurred only rarely, it was unlikely to be an antigen caused by genetic variation in human blood.
方法：按who规定的原理和方法进行：对流感流行株、抗原和基因变异以及血清抗体和病毒多病原实行监测。
Methods: According to the principle and methods of the WHO stipulation, the influenza epidemic strains, antigen, gene variation, serum antibody and virus multi-pathogen were monitored.
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