what virus causes mumps
Causes. The cause of mumps is the mumps virus, which spreads easily from person to person through infected saliva. If you're not immune, you can contract mumps by breathing in saliva droplets of an infected person who has just sneezed or coughed.auses. The cause of mumps is the mumps virus, which spreads easily from person to person through infected saliva. If you're not immune, you can contract mumps by breathing in saliva droplets of an infected person who has just sneezed or coughed.