What made you want to look up mean? Please tell us where you read or heard it (including the quote, if possible).
Malaria - and its cousin, yellow fever - had significant implications during the war and the debilitating consequences of the disease were already certain before the Civil War had started in earnest and well before its final history had been written.
1 Sylvatic (or jungle) yellow fever: In tropical rainforests, yellow fever occurs in monkeys that are infected by wild mosquitoes. 2  The infected monkeys then pass the virus to other mosquitoes that feed on them. 3  The infected mosquitoes bite humans entering the forest, resulting in occasional cases of yellow fever. The yellow in the name refers to the jaundice that affects some patients. 2  Up to 50% of severely affected persons without treatment will die from yellow fever. 3  There are an estimated 200 000 cases of yellow fever, causing 30 000 deaths, worldwide each year, with 90% occurring in Africa.