结论：郑州市孕妇中存在人微小病毒B19的感染，可能导致不明原因流产或死胎。

Conclusion: the infection of human parvovirus B19 exists in the pregnant women in Zhengzhou, which may explain the unidentified reason abortion or stillborn foetus.

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前言： 目的：探讨人微小病毒B19（H PVB19） 感染的特发性血小板减少性紫癜（ITP）患儿血清对人巨核祖细胞（ CFU-MK） 增殖的影响。

Objective:To investigate the effects of serum infected by human parvovirus B19(HPVB19) on the proliferation of colony forming unit-megakaryocyte (CFU-MK) in ITP patients.

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