Chagas disease is a parasitic infection caused by Trypanosoma cruzi, which is found in the faeces of the triatomine bug, popularly known as the kissing bug because it bites humans on the face as they sleep. It creates a sudden and severe illness that lasts for a long time. It is transmitted from mother to foetus during pregnancy, through blood transfusions, and occasionally through organ transplantation. Fever, headache, and local swelling at the bite site, as well as enlarged lymph nodes, are early indications of Chagas disease. Purplish inflammation of an eyelid or skin lesion is the first obvious sign in around half of those bitten by the triatominae bug.