Evolution in the human body

 http://www.sciencedaily.com/releases/2014/12/141211141833.htm

This article talks about how studies of many primate species (including humans) has shown us how we have evolved to fight infectious bacteria in the bloodstream. The bacteria feeds off of the iron in the bloodstream. It talks about how scientists have only been aware of nutritional immunity for 40 years, but over the past 40 million years of primate evolution, this battle for iron between bacteria and primates has been a determining factor in our survival as a species. The human body has evolved to have a runny nose, sneeze, become inflamed in order to rid the body of the bacteria. The body also does a variety of things under the skin to fight the bacteria it can "starve the bacteria out" by hiding the circulating iron. The article also talks about how the harmful pathogen has also evolved, and in certain cases can find where the iron is being hidden and take it causing diseases such as meningitis, gonorrhea, and sepsis. The main point of the article is that evolution is constant and continues to happen in the body over generations as pathogen and host evolve to fight off the other one, and by observing these changes over time scientists can take successful things that have happened and apply them to different situations.