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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 yellow fever (also known as âjungle yellow feverâ) occurs when the disease is passed from monkeys infected by wild mosquitoes to humans. 2  This can occur when humans enter jungle areas.