jungle fever

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Malaria, especially a severe form occurring in the East Indies and other tropical regions.
• noun Any of various diseases native to the tropics.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun medicine Any of several tropical diseases, but especially malaria.
• noun slang Attraction of a person of non-African descent towards people of African descent.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun severe form of malaria occurring in tropical regions