It exists mostly among children from poor families.

它主要存在于贫困家庭的孩子中。

youdao

In 2008, there were 247 million cases of malaria and nearly one million deaths - mostly among children living in Africa.

2008年有2.47亿疟疾病例，近百万人死亡，其中大多数是非洲儿童。

youdao

In 2008, malaria caused nearly one million deaths, mostly among African children.

2008年，疟疾导致近百万人死亡，其中大多数是非洲儿童。

youdao

Malaria caused almost one million deaths, mostly among children in Africa.

VOA: special.2009.05.26

The Joint Committe on Vaccination and Immunisation (JCVI) said the new strategy would avert a large number of flu cases among children as well as many severe cases and deaths, mostly among the elderly and others vulnerable to the infection.

BBC: Flu vaccines for all children