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   ocr: Before Translation Measies is an acute, highly intectlous viral disease, with cough, fever, and maculopapular rash. It is worldwide endemicity. The infective particle is an RNA virus about 100-150 nm in diameter, measured by ultrafiltration, but the active core is only 65 nm as measured by inactivation atter electron rradlation. Negative staining in the electron microscope shows the virus to have the helical structure of a paramyxovirus with the helix being 18 nm in dlameter. Measies virus will infect monkeys easily and chick embryos with difficulty. In tissue cultures the virus may produce gi ...