Other apicomplexan pathogens include the malaria parasite "Plasmodium" and the toxoplasmosis parasite "Toxoplasma". Other infectious agents include cytomegalovirus, the herpes simplex virus, hyperthermia, toxoplasmosis, and syphilis. Protozoans also occur, including the potentially fatal "Toxoplasma gondii", which causes toxoplasmosis. Retinitis may be caused by several infectious agents, including toxoplasmosis, cytomegalovirus and candida. The protist responsible for toxoplasmosis is "T. gondii". In mainland Europe, it is a carrier of trichinosis, leptospirosis, toxoplasmosis and adiaspiromycosis. Epilepsy may also occur after other brain infections such as cerebral malaria, toxoplasmosis, and toxocariasis. Acute toxoplasmosis is often asymptomatic in healthy adults. Infections with toxoplasmosis usually cause no obvious symptoms in adults. This can include potentially harmful pathogens such as listeria, toxoplasmosis, and salmonella. Weil's disease, toxoplasmosis and trichinosis are the best known. Other conditions include neurosyphilis, toxoplasmosis and Refsum's disease. There was no evidence of maternal transmission of antibodies or congenital toxoplasmosis. If infected during pregnancy, a condition known as congenital toxoplasmosis may affect the child. The classic triad of congenital toxoplasmosis includes&colon; chorioretinitis, hydrocephalus, and intracranial arteriosclerosis.