Nettai's chimpanzee
(Electron microscope image)
(Date of photograph unknown)
^BYellow fever mosquito.^b Coloured Scanning Electron Micrograph (SEM) of the mosquito ^IAedes aegypti,^i a blood-sucking insect that spreads yellow fever, dengue fever and filiariasis. The head is at centre with two large compound eyes (grey). The mouthparts (proboscis) that the mosquito uses to pierce the skin of its victims is at lower centre. Only female ^IA. aegypti^i mosquitoes carry the arbovirus which causes yellow fever in humans. Affected patients develop a fever, and the skin becomes yellow due to jaundice. Yellow fever was once a fatal infection throughout the tropics, but now occurs only in parts of tropical Africa and South America. Magnification: x50 at 6x6cm size.