It has long been known that the level of serum iron in animals falls during infection.

人们早就知道，在感染期间，动物的血清铁水平会下降。

youdao

Ethnicity, sibling relations, number of household residents and maternal level of education are factors associated with the risk of TB infection among children in Greenland.

种族、兄弟姐妹关系、家庭居民数量和母亲的教育水平是格陵兰儿童肺结核感染相关的危险因素。

youdao

One reason to suspect this is that a country's level of Toxoplasma infection seems to be related to the level of neuroticism displayed by its population.

导致这一怀疑的现象有几点。首先，一个国家人口的弓形虫病感染比率似乎和其国民的神经敏感程度有某种联系。

youdao

"We have to remember that the UK has the highest level of infection of E. coli 0157 in the world, " he added.

BBC: Mason Jones

And stopping, or slowing, that virus is not impossible, as the example of Uganda, which has reduced its level of infection from 14% to 8% over the past decade, shows.

ECONOMIST: Even in Africa, it can be won

Recent conflict and the resulting disruption in both the education and health care systems are expected to have a negative impact on the level of HIV infection and it is now more important than ever to improve knowledge and awareness of the disease.

UNESCO: Protect, Prevent, Respect: Empower