Toxoplasma gondii is a protozoan parasite that can cause a wide range of symptoms, from flu-like symptoms to severe brain and eye damage, especially in people with weakened immune systems. An IgM test is a blood test that detects the presence of IgM antibodies in the blood, which are produced by the immune system in response to an infection. In the case of Toxoplasma gondii, the presence of IgM antibodies indicates an active or recent infection. However, it is important to note that a positive IgM test result does not necessarily mean that the individual has symptomatic toxoplasmosis, as some people may have a subclinical infection or have already cleared the parasite from their system. Confirmation of infection usually requires additional tests and clinical evaluation.