The screwworm reached Mexico in November 2024, after moving upwards through Central America.

Parasites do creatively gruesome things to their host.

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

An allergic reaction happens when your immune system overreacts to something that should be harmless. Whether that happens can be thanks to your genes, your environment or a combination.

Save the pandas, sure, but what about the worms in their guts?

Schistosomiasis is a neglected tropical disease that triggers specific immune responses in the body. Identifying those hidden immune signatures can help improve detection and treatment.

Breaching is one of the most spectacular behaviors among marine animals. A recent review shows that many shark and ray species breach, and identifies the most commonly hypothesized reasons.

Getting drugs into the brain is a challenge. A new study suggests a brain parasite may be able to help.

Pregnant people can contract toxoplasmosis, which causes birth defects like blindness and brain defects. The parasite is more common than you might think.

If the needs of both parasites and hosts are met by the niche, they can move in. Increasing biodiversity may therefore be a double-edged sword.