Final answer:
Yellow fever is a severe infectious disease transmitted by mosquitoes, with a vaccine available for prevention but contraindicated for those with an egg allergy. Severe cases can lead to death, and patients may become immunocompromised, increasing susceptibility to other infections. Additionally, consuming raw egg whites can lead to biotin deficiency due to avidin binding.
Step-by-step explanation:
Yellow fever is a serious viral hemorrhagic disease transmitted by the Aedes aegypti mosquito, with symptoms ranging from fever and jaundice to more severe complications like multiple organ failure. There is an effective vaccine available for prevention, but its use is contraindicated for individuals with an egg allergy, as the vaccine contains egg proteins. In severe cases, up to half of the patients with moderate to severe disease may die. Patients with malignant yellow fever become severely immunocompromised, leading to increased susceptibility to bacterial superinfections and pneumonia. Biotin deficiency can result from consuming raw egg whites due to the presence of avidin, which binds to biotin and prevents its absorption, leading to symptoms like hair loss, greying of hair, and nervous symptoms.