Shock

The symptoms of the yellow fever virus might vary. Some people may have no symptoms. You can experience symptoms similar to the flu, including aches, pains, and fever, or you might start bleeding and get liver damage. While some people have serious, life-threatening illnesses, others only experience mild symptoms. A few people experience delirium. Their blood pressure is extraordinarily low (shock). Severe infection can cause seizures, malfunction of several organs, and coma may occur. With severe bleeding and a fever, death rates can reach 50%. When a person's blood pressure falls so low that the body's cells aren't getting enough blood and oxygen, they experience shock.

If you already have yellow fever, you can't spread it to someone else. For instance, it cannot be shared through kissing or coughing. But if you have the disease, a mosquito may bite you and spread it to someone else.