A 29-year-old woman, at 24 weeks of gestation, presents to her obstetrician with mild fatigue and low-grade fever for the past week. She denies respiratory symptoms but reports occasional headaches and lymph node swelling in her neck. She has no significant medical history and is not on any medications. She has a pet cat at home. Physical examination reveals palpable, non-tender cervical lymphadenopathy. The rest of the physical examination, including fetal assessment, is unremarkable. Her serology is significant for positive IgG antibodies for Toxoplasma gondii, indicating past infection. What is the most common route of transmission of Toxoplasma gondii in pregnant women?
