Toxoplasmosis, a disease caused by parasites, is mostly symptomless, except for those with weak immune systems and babies whose mothers become infected for the first time during pregnancy. Problems can include damage to the brain, eyes, and other organs. It is mainly caused by contact with waste from an infected cat or eating contaminated meat. Qualitative determination of IgG antibodies to Toxoplasma gondii (T. gondii) to aid in the determination of immune status of individuals including pregnant women. If IgG antibody is detected, it is recommended that IgM testing be performed if more precise knowledge of the time of infection is needed (e.g., pregnant women). A positive IgM but a negative IgG result should be viewed with suspicion; the patient should be retested two weeks after the first test.