THE human immunodeficiency virus, HIV-1, the cause of the global AIDS epidemic, is the most intensively studied pathogen in history.(引起艾滋病全球性傳播的人體免疫缺陷病毒（HIV-1），一直被人們最為集中的研究其病原體。)

Deforested areas increase contact between wildlife and humans and affect pathogen transmission.(毀林地區野生動物與人類的接觸增加，導致病原體的傳播。)

Nosema bombi is a bee pathogen that has also afflicted European bumble bees.(微孢子蟲是一種蜂類病原體，它也困擾歐洲的大黃蜂。)

But the potato psyllid is merely the vector. The actual pathogen is still elusive.(但馬鈴薯木虱只是傳播媒介，真正的病原體尚不清楚。)

The problem, of course, is that a tumor is not exactly a pathogen.(當然，問題在于腫瘤并不真的是一種病原體。)

Whenever it meets one that is "not self" and thus likely to be part of a pathogen, it destroys it.(只要遇到一個“非本體”分子，就有可能是病原體的一部分，免疫系統就會將它消滅。)

I've always thought that when I get a fever, it's my body trying to make things uncomfortable for the invading pathogen.(我很早就知道，發燒的時候，其實是我的身體正在對入侵的病原體做出抵抗。)

Once a new pathogen is introduced in one individual, it may spread to the larger population.(一旦一種新的致病源傳播給一個個體，它可能向更多的人傳播。)

Understanding how a pathogen or humans are affecting the sturgeon could be key to conserving them.(了解一種病原體或人類是如何影響鱘魚的，對于保護它們是至關重要的。)

Thus a receptor may be a protein, enzyme, membrane channel, or a region of a foreign pathogen.(這樣的受體可以是蛋白質、酶、膜通道或外來病原體的一個區域。)