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Male fish that nibble parasites off larger fish punish females of the species when they bite and drive off the bigger fish.
 parasite animal intelligence social fish toread
Some 18m people worldwide have Chagas disease, caused by an infection with the parasite Trypanosoma cruzi. Recently, researchers discovered having this disease puts the individual at increased risk of stroke due to heart complications and blood clots.

2010-04-14

 disease tropical parasite stroke Chagas
A new species of leech, discovered by an international team of scientists, has a preference for living up noses. Researchers say the leech can enter the body orifices of people and animals to attach itself to mucous membranes.

2010-05-15

 nose leech parasite Amazon Peru blood
The number of cases of a deadly parasitic disease has more than doubled in the last decade, according to the World Health Organization (WHO).

2010-10-15

 disease dengue parasite
The teeming trillions of bacteria in the digestive tracts of mice have been shown to affect the animals' brain development and behaviour. Mice bred in sterile environments without these "gut flora" were seen to be more adventurous and less anxious than mice with normal gut flora. The research adds weight to the idea that gut bacteria are a critical part of the overall development of mammals...

2011-02-01

 parasite symbiosis gut microorganism digestion health bacteria behaviour cohabitation
Worms forced to reproduce asexually succumbed to a nasty bacterial infection and died. The researchers say the results are the most convincing evidence to date for a key theory in evolutionary biology. The theory holds that sex evolved because it lets organisms reshuffle their genes into new combinations to stay a step ahead of parasites.

2011-07-08

 worm sex reproduction evolution asexual cloning biology parasite resistance
Jaroslav Flegr is no kook. And yet, for years, he suspected his mind had been taken over by parasites that had invaded his brain. So the prolific biologist took his science-fiction hunch into the lab. What he’s now discovering will startle you. Could tiny organisms carried by house cats be creeping into our brains, causing everything from car wrecks to schizophrenia?

2012-03

 brain biology parasite health