The intensity of transmission depends on factors related to the parasite, the vector, the human host, and the environment.

传播严重程度取决于寄生虫、病媒、人类宿主和环境等有关因素。

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They will also collaborate with researchers at the University of California in San Diego to study other pathogens that require a human host, such as malaria.

他们还将和美国加州大学圣地亚哥分校的研究者们合作研究别的需要人类当宿主的疾病，如疟疾。

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When guinea-worm disease is eradicated, this will be the first disease kicked out of its human host, not by a powerful vaccine, but by health education and behaviour change.

当几内亚线虫病得以消灭之时，将是不用强有力的疫苗，而是利用健康教育和行为改变从人类宿主中剔除出去的首个疾病。

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Although few pathogens can survive in both an animal and a human host, there is laboratory evidence that resistance can be passed across the species barrier through meat products.

BBC: Animals and antibiotics: the risks

MalariaControl.net can handle a lot of different sorts of variable, from the changing density of parasites within a human host as an infection progresses to the sort of treatment available in different places around the continent.

ECONOMIST: Linking up computers to defeat malaria

Economic conditions create springboards for changes in a host of human behaviors.

FORBES: The Best Gun Control Measure Is Always A Job