Rise of cities, risky behavior in west central Africa between 1884 and 1924 at root, study says.

研究称，随着城市的兴起，中非西部地区危险的行为也于1884年到1924年之间开始萌芽。

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The research, which is published in the current issue of Nature, found that HIV began spreading between 1884 and 1924, around the same time urban centers in west central Africa were established.

这项发表于《自然》杂志现刊的研究发现艾滋病毒于1884年到1924年之间开始蔓延，大约与此同时中非西部地区的城市中心区也开始兴起。

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One such laboratory is the Tropical Diseases Research Unit at Lambaréné in Gabon on the west coast of central Africa.

其中一个这样的实验室是位于非洲中部西海岸的加蓬的热带疾病研究中心。

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In west and central Africa, one newborn in twenty dies.

VOA: special.2009.05.25

West and Central Africa's exchange rate no longer seems so overvalued as it did.

ECONOMIST: The CFA franc and the euro

The WHO campaign was launched last week in a bid to immunise more than 15 million children in west and central Africa against polio.

BBC: Most parts of Nigeria have embraced the vaccine programme

The last 160 individuals are found in West and Central Africa.

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