This Cat Parasite Infects Billions of People. Scientists Say We’ve Been Underestimating It

A parasite spread by cats may be far more dangerous than previously thought. Toxoplasma gondii, or toxo, infects billions of people worldwide. Scientists are now warning that it's a major cause of vision loss and other serious complications, and the infection may even alter human behavior. According to io9, we've been significantly underestimating the public health threat posed by this common infection, which spreads through contact with infected cat feces or undercooked meat.

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