Kangaroos harbour a vast range of parasites.

袋鼠身上有各种各样的寄生虫。

《柯林斯英汉双解大词典》

In nature, itching and scratching help animals get rid of parasites, plant material, or other unwanted baggage.

事实上，骚痒和抓挠帮助动物去掉寄生虫、植物体或其它不想要的垃圾。

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You rarely get a blood smear with hundreds of parasites obvious in it.

你很难在一个血液涂片上很明显得看到数百计的寄生虫。

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The other advantages of hair sheep include that it's more resistant to parasites, so they're less prone to infection."

VOA: special.2009.08.03

So, not just a spectrum of viruses, but there's viruses and bacteria and parasites and other microorganisms that can cause disease.

所以,不是只有病毒,还有病毒,细菌,寄生虫,和其它各种微生物都能导致疾病

耶鲁公开课 - 生物医学工程探索课程节选

After a week or two, the parasites invade red blood cells and reproduce thousands of times.

VOA: special.2009.05.26

Thirteen of these birds came from infested nests and 9 from nests that were free of parasites.

ECONOMIST: Parasitology: The song does not remain the same | The

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

And a back-of-the-envelope calculation based on the 1.8m sorts of organism recognised so far as species under the Linnaean system, on the rate at which new species are being discovered and on such ecological matters as the average number of parasites (themselves new species) that each free-living species harbours, suggests the final total may be around 30m.

ECONOMIST: Biodiversity