Here a child in Nepal drinks from a well containing water contaminated with arsenic, which can lead to abnormal heart beat, blood vessel damage and cancer, among other ill effects.
His analysis, Mr Zhanqiang the second reason for the question of the possibility of large number, perhaps the process of collecting blood samples from being contaminated.
他分析说，冯战强的问题第二种原因可能性大一些，可能是采集过程中血样被污染。
3
Various puncture needles are usually repeatedly used in clinic. Because of their complex structure, communicable contaminated materials and blood are easy to be left in the needles.