Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Parasites - Toxoplasmosis (Toxoplasma infection)? ?
    ### Response:
    Toxoplasmosis is caused by the protozoan parasite Toxoplasma gondii. In the United States it is estimated that 22.5% of the population 12 years and older have been infected with Toxoplasma. In various places throughout the world, it has been shown that up to 95% of some populations have been infected with Toxoplasma.
    