It’s difficult to completely get rid of dust mites, but there are ways to reduce your exposure to them. Dust mites are microscopic, spider-like creatures found in almost all households. And while ...

If you’ve handled cat litter or eaten raw meat or unwashed produce, there’s a chance you might have a permanent toxoplasmosis ...

In a 2014 Nature paper, Ralston described this awkward process — trogocytosis, or “cell nibbling.” It was a revelation at the ...

Parasites are known to infect human cells through a variety of ingenious mechanisms. Many of them have even evolved sophisticated strategies to evade a host’s immune system by avoiding it entirely.

From fleas to mosquitoes, there's no shortage of organisms we like to consider pests – and, not surprisingly, the majority ...

Cerebrospinal fluid can sometimes leak or collect in the brain without an identifiable cause, leading to symptoms that can be difficult to diagnose.

Our ability to peer inside the human genome has shown that in fact ... mosquito that prevent it from carrying the malaria parasite. Near future: Science fiction becomes reality More than 50 ...

Aspergillus species are "widespread environmental saprotrophs" that can cause severe infections in humans, livestock, and plants.

Nasal mucus is created by the tissue lining of your nose and sinus passages. Your body produces more than a liter of mucus daily, whether you are healthy or fighting off a cold. Most of the time ...

Bacteria can grow in this fluid, causing a middle ear infection. An unresolved cold can lead to a sinus infection, also called infectious sinusitis. It causes inflammation in your sinuses ...

Your immune system is the guardian of your galaxy, protecting your body from all sorts of germs and invaders. From your skin to tiny cells, use WebMD's slideshow to learn about the parts of your ...