Mumps virus,computer illustration.A mumps virus particle contains ribonucleic acid (RNA) enclosed in spherical protein shell,or capsid.The shell is covered in surface proteins haemagglutinin-neuraminidase fusion protein shown in illustration,which are used to attach to penetrate host cell.Once inside cell,the virus particles (virions) use cell machinery to make more copies of themselves.Mumps virus is contagious paramyxovirus,causing swelling of parotid salivary glands,fever,headache vomiting.Infection can spread to pancreas,brain testicles.In adult males,infection can cause sterility.

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