Protozoan parasites are responsible for several significant diseases. Malaria, caused by Plasmodium species, affects millions worldwide, particularly in tropical and subtropical regions. Amebiasis, caused by Entamoeba histolytica, leads to severe diarrheal disease. Other diseases include Leishmaniasis, transmitted by sandflies, and Chagas disease, caused by Trypanosoma cruzi and spread by triatomine bugs.
