A positive IgM test for Toxoplasma gondii refers to a blood test for antibodies related to Toxoplasma gondii. When Toxoplasma gondii infects the body, the initial infection will be positive for IgM antibodies and only after a period of time will it be positive for IgG antibodies. At the end of the disease, IgM antibodies will become negative and only positive IgG antibodies will remain. When the next Toxoplasma gondii infection recurs, IgG antibody positive will be followed by IgM antibody positive. Therefore, if the blood test for Toxoplasma gondii is positive for IgM antibodies, it is possible that the infection is a first-time infection or a recurrence of such an infection, and it should be judged by whether the IgG antibodies to Toxoplasma gondii are also positive. Toxoplasma gondii infection is not a concern for the vast majority of immunocompetent people, as most are recessive infections. However, in the case of immunodeficient patients, or pregnant women, this is the time to take it seriously, as it does have the potential to cause some danger.