LONDON SCHOOL OF HYGIENE & TROPICAL MEDICINE / SCIENCE PHOTO LIBRARY. LONDON SCHOOL OF HYGIENE & TROPICAL MEDICINE / SCIENCE PHOTO LIBRARY.
False colour transmission electron micrograph (TEM) of yellow fever viruses (black circles) in the cell lining of a yellow fever mosquito, Aedes aegypti. The virus occurs in tropical Africa, regions of South America & the West Indies. It is transmitted to humans during feeding, when the female mosquito (male drinks nectar) inserts her proboscis into the skin & drinks blood. The viruses pass down the proboscis mixed with saliva, which acts as an anticoagulant. They cause degeneration of liver & kidney tissue. Symptoms include headaches, fever, vomiting, & jaundice. The disease is often fatal. Mag: X81,000 at 35mm.
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