Research shows a virus was actually found in throats of 40% of the people in a research group. This is important because that same 40% actually tested lower in mental awareness and visual processing than the rest of the group. This virus usually attacks green algae, so it's strange how its found in humans. This is really interesting because it leads to the idea that this virus actually makes people dumber. When I first looked into this research I was shocked; is it possible a virus can actually make you more stupid than people that don't have it? How does one get this disease?
Theres hundreds of different viruses and even more mutations to each one! The virus Clorovirus ATCV-1 has been around for years, but it had never been found in healthy humans before. It's not harmful, unless you consider loosing a few points in an IQ test "harmful". It amazes me that this virus has some effect on your brain, but leaves you healthy. This study showed that there are possibilities of more microbes that have affects on your mental abilities.
Dr. Robert Yolken, a virologist that was published in the Proceedings of the National Academy of Sciences, commented on this studying saying "this is a striking example showing that the 'innocuous' microorganisms we carry can affect our behavior and cognition". It amazes me that there are organisms that can actually affect our mental abilities. I didn't even know that was possible until this article informed me!
http://www.clevelandleader.com/node/23380

Really interesting study and a bit scary as it would be hard to know you have this.
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