Immune system genes respond to pathogens, which change rapidly, so the genes also change rapidly. If the pathogen is no longer there, then you don't need the immune system gene in the host.
Jianzhi Zhang
5 quotes about pathogens follow in order of popularity. Be sure to bookmark and share your favorites!
It's one of a number of pathogens that are probably in the water that could cause illness.
Tom Skinner
Under those same conditions, one-minute exposure could kill 99.99% of other waterborne pathogens that do not exist as spores.
Jon Calomiris
Humans have always been attacked by novel pathogens. This process has been going on for millennia. But it does seem to be happening very fast in these modern times.
Mark Woolhouse
We most likely will get it from an animal and it will probably be the result of changes in human ecology --humans moving into new areas of the world and coming in contact with unknown pathogens.
Mark Woolhouse
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