| importation of wild poliovirus into qinghai province--china, 1999. | indigenous wild poliovirus was last isolated in china in 1994. on october 13, 1999, a case of acute flaccid paralysis (afp) in a 16-month-old boy was reported to public health authorities in xunhua autonomous county, haidong prefecture, qinghai province, china. following onset of paralysis on october 12, the boy was no longer able to stand or walk. two stool samples, taken within 14 days of onset of paralysis, were analyzed in the qinghai provincial laboratory and yielded poliovirus. the isolate ... | 2000 | 11243437 |