Yellow fever is a viral illness historically associated with outbreaks in tropical and subtropical regions. Symptoms include high fever, jaundice, and sometimes fatal internal bleeding. During earlier centuries the disease caused devastating epidemics in port cities, shaping public fears about travel and climate. Literary references to yellow fever often evoke the atmosphere of danger surrounding unfamiliar environments. Poets may employ the disease as a symbol of unseen forces lurking within nature, emphasising humanity’s vulnerability to the unpredictable power of the natural world.

Yellow fever carries strong historical and geographical associations that make it especially rich in literary study. Because it is transmitted by mosquitoes and linked with outbreaks in tropical and subtropical regions, the term can evoke heat, ports, trade routes, imperial expansion, and colonial vulnerability as well as bodily suffering. Its symptoms, especially fever and jaundice, give poets vivid sensory material: burning heat, yellowed skin, decay, delirium, and mortality. Students should pay attention to whether the term is being used medically, historically, or symbolically. In some poems it may represent invisible danger in apparently lush landscapes; in others it may stand for fear, epidemic panic, or the fragility of empire. Related concepts include cholera, pestilence, epidemic, jaundice, and contagion.