Seattle school officials said students won't be allowed back to class after winter break unless they have all their vaccinations.
The National Hockey League's puzzling outbreak of the mumps has now reached the league's biggest star.
Pittsburgh Penguins center Sidney Crosby will sit out the next two games as a precaution, though general manager Jim Rutherford says it does not appear the star is dealing with the mumps.
Anaheim Ducks veterans Corey Perry and Francois Beauchemin have been diagnosed with mumps.
