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

VOA: special.2009.05.26

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

Unlike parasites,however, they do not rob the trees of nutrition.

VOA: special.2010.04.06

Ayala discovered that parasites were responsible for Chagas, an often fatal disease afflicting millions of people in the Americas.

VOA: standard.2010.04.05