The Center for Disease Control (CDC) is a great reliable resource for this project. Besides using a database you can search your parasite at http://www.cdc.gov/parasites/
Remember - academic databases will provide you with a formatted MLA citation. Refer to those pages in this guide for any revisions needed to change it to MLA 8th ed.
MLA 8th Website Format:
Last Name, First Name. "Title of Article." Title of the Website, Publication Date, URL. Date of Access.
"Malaria". Centers for Disease Control and Prevention, 5 Oct. 2016, www.cdc.gov/malaria. 17 Nov. 2017.