Is the rabies virus neutralizing antibody titer stable during long-term storage?

Factors influencing the immune response after a double-dose 2-visit pre-exposure rabies intradermal vaccination schedule: A retrospective study

“…From a public health point of view, dose-sparing schedules are also of interest in periods of stock rupture in travel clinics [18] or for people living in endemic regions. In a reply to De Pijper et al [13], Zhao et al [23] discussed the fact that this kind of study design cannot prove that subjects were not previously vaccinated. However, blood samples before immunization are not considered to be standard of care following the vaccine guidelines of the Belgian Armed Forces.…”