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October 27, 2023

The 19th-century viral scourge of the U.S. South known as “yellow fever” seems to be on the brink of a resurgence. Tropical disease experts predict a return of the historically devastating disease to the U.S. 

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Yellow fever is still active in Latin America and Africa, causing 30,000 deaths annually, but local outbreaks have been absent here since 1905. Other tropical diseases, however, have landed on our shores. Earlier this year, several cases of malaria turned up in Florida. Mosquitoes have recently tested positive for West Nile virus in Texas. Locally-transmitted cases of Zika, dengue, and chikungunya have also been  identified in the past few years.

WHAT IS YELLOW FEVER?

Yellow Fever is a member of the Flaviviridae family of viruses and is a known arbovirus (transmitted through the bite or sting of an insect). In this case, the culprit is a mosquito known as Aedes aegypti.

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Symptoms may appear within three to six days of the virus entering the body. Some experience no symptoms, but those who do experience headache, muscle pain, and nausea/vomiting. Fortunately, in most cases, symptoms subside in three to four days. If you survive the disease, it usually means lifelong immunity.

Yellow fever has no cure, and an unlucky 15-20 percent of victims, progress to a more serious second phase shortly after an apparent recovery. These develop high fever and inflammation of the liver and kidneys. Liver malfunction leads to a condition called “jaundice,” a yellowing of the skin and eyes (hence the name “yellow fever”). Damage to the GI tract leads to vomiting black blood in late stages. At this point, a death rate of 20-60 percent due to organ failure can be expected.

HISTORY OF U.S. YELLOW FEVER OUTBREAKS

Throughout its history, the United States has experienced yellow fever epidemics reaching as far north as Philadelphia, where 5000 deaths were recorded from the disease in 1793. Most outbreaks, however, occurred in Southern seaports (New Orleans, Galveston, Charleston, Savannah) or along the Mississippi (Vicksburg, Memphis). The New Orleans epidemic of 1853 killed almost 10 percent of the city’s population.

Back then, the disease was sometimes referred to as  “yellow jack” after the nautical flag ships arriving from the Caribbean flew to indicate a possible outbreak requiring quarantine.

Although previous epidemics of “yellow jack” are now forgotten, some outbreaks killed more U.S. citizens than more famous disasters of the era, including the Great Chicago Fire or the San Francisco earthquake. The last major outbreak was in New Orleans in 1905, when 1000 people perished.