RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Rift Valley fever virus particle, computer artwork. This virus particle consists of an RNA (ribonucleic acid) genome enclosed in a protein capsid (yellow), which is itself surrounded by a glycoprotein envelope (orange). Rift Valley fever occurs in Africa, infecting humans, cattle, sheep, rodents and other species. It is transmitted by insects, mainly mosquitoes, and causes chills, fever, a headache and joint and muscle pain. It is rarely fatal, but can cause retinal haemorrhages that may lead to visual impairment.
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