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

VOA: special.2009.05.26

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