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Yellow fever is an acute viral infection. You can catch it by being bitten by mosquitoes that are mostly found in Africa and South America; they carry the virus and transmit it into the bloodstream. There are varying degrees of yellow fever in humans. Most people develop none or at least very mild symptoms for the first, early and acute phase, which takes 3-6 days to appear. Usually, the symptoms will dissipate within 7-10 days, this is phase two, but 15% of people with yellow fever will enter the toxic third phase.

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1. Fever

Phase one of yellow fever will typically start with a fever. A fever is your body's way of dealing with foreign bacteria. A high fever is considered anything over 38C (100.4F). You will feel hot and sweaty, but with a clammy touch to the skin. You'll experience weakness and lethargy and often won't be able to go about your daily routine. A fever is not always linked to the flu but you can also experience flu-like symptoms with a fever, and it is often prescribed that you have bed rest until it passes. However, a yellow temperature will not pass but begin a cycle of other symptoms of the disease.

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