Despite widespread recommendations for annual revaccination, information available today suggests that current vaccination practices in North America do not necessarily correspond with the body of knowledge pertaining to duration of immunity from licensed vaccines. (caberfeidh.com)
The practice of annual vaccination in our opinion should be considered of questionable efficacy unless it is used as a mechanism to provide an annual physical examination or is required by law (i.e., certain states require annual revaccination for rabies). (shirleys-wellness-cafe.com)
The initial vaccination requires 2 doses, 2 - 4 weeks apart, followed by annual revaccination. (parkridgevet.com)