Under a microscope, the protozoan's adaptations ... according to the CDC. Hookworms: A good reason not to go barefoot in the summer, at least not when walking through a freshly fertilized field.

When the string is pulled out, it's examined under a microscope to look for parasites ... These are types of hookworms. Hookworms live in the small intestines. Most hookworm infestations don ...

In Ecuador, they know what a parasite looks like under a microscope. In the U.S., because hookworm is rare, physicians who won't know what to look for could miss it. Are there unique difficulties ...