Leeches are parasitic worms that feed on the blood of animals.
The strange interaction has never been documented in nature before.
The parasite infects a staggering 30-50% of the world's population.
"If you ate a salad from McDonald's since mid-May and developed diarrhea and fatigue, contact a health care provider about testing and treatment," a health official said.
The birds are carefully adapted to the absentee parenting lifestyle.
The ancient stools provide insights into parasitism, diet and subsistence patterns of past populations.
The insect features a trio of spines along its back, like a stegosaurus.
Ticks apparently sucked the fun out of dinosaur summers, too.
The North Korean defector's life was saved by doctors after he fled across the DMZ last month.
The parasite got into his eye because he was splashed while waiting in line for a water park ride, the man's lawsuit alleges.
North Korea's health problems were highlighted by the defection of one soldier to the South.
In the U.S., 12 to 19 million people get sick from waterborne infectious disease each year.
Turns out sewer systems can only do so much to cut down on infections.
This parasite, carried by a sandfly, kills tens of thousands pf people every year. Treatment exists, but the sickness can still disfigure and kill people.
Climate change is enabling this organism, which causes meningitis, to inhabit new regions.
The amoeba was living in a rapids course at dangerously high levels.
Researchers say ivermectin, a drug designed to fight parasitic worms, could also help fight the spread of malaria.
The icky parasite will make you think twice before jumping into that public pool.