Roundworms, also known as nematodes, are a leading cause of parasitic infection worldwide, causing painful swelling, severe abdominal pain and even blindness. Now, scientists say that viruses carried ...

As school starts back up, so does the number of head lice cases. But humans have been dealing with the parasites for millennia—and that may continue indefinitely. Head lice are some of our oldest ...

When Dr. Isaac Chikwanha was a kid in Zimbabwe, he got schistosomiasis. At the time, he didn't think about the cause of this parasitic disease: a worm that penetrates your skin and takes up residence ...