WHO spokesman Gregory Hartl says there have been large outbreaks of Ebola recorded in Uganda and the Democratic Republic of Congo. He says the outbreak in Guinea is relatively small compared to the one in Uganda in 2000 and 2001, which infected more than 400 people. Four cases of the disease have been reported in the Guinean capital, Conakry, But Hartl says it is not unusual to have cases in capital cities. "In Gabon, in the 1990s I believe there were cases in Libreville. The source of infection is still quite localized in the southeast of Guinea."____________________________Hartl says it is essential to stop the chains of transmission. Lisa Schlein for VOA news, Guinea. 世界卫生组织的发言人格里高利`哈特尔表示有记录显示乌干达与刚果民主共和国曾爆发过大规模的埃博拉病毒.他表示几内亚爆发的规模与乌干达在2000年与2001年爆发的规模相比相对较小. \"90年代在加蓬,我相信利伯维尔有病例.感染源仍然位于几内亚的东南部地区.\"____________________哈特尔称阻断传播渠道十分必要.丽莎`斯克林,VOA新闻,几内亚.