Each of the following statements concerning viral vaccines is correct EXCEPT:

  •   With inactivated vaccines, IgA mucosal immunity is usually induced.
  •  In live, attenuated vaccines, the virus has lost its ability to cause disease but has retained its ability to induce neutralizing antibody.
  •  With inactivated vaccines, protective immunity is due mainly to the production of IgG.
  •  In live, attenuated vaccines, the possibility of reversion to virulence is of concern.