Obligate intracellular parasites have evolved a remarkable assortment of strategies to scavenge nutrients from the host cells they parasitize. Most apicomplexans form a parasitophorous vacuole (PV) within the invaded cell. a replicative niche within which they survive and multiply. As well as providing a physical barrier against host cell defense mechanisms. https://www.greenresourcesredux.com/product-category/testing-strip/