Efficacy of intradermal vaccination

Area of Science:

• Veterinary immunology
• Vaccinology
• Animal health

Background:

• Intradermal (ID) inoculation is an explored vaccination route for diverse species, including animals and humans.
• Various antigen types (viral, bacterial, parasitic, fungal) have been administered via ID route with mixed outcomes.
• Clinical protection and body weight changes are key outcomes emphasized in ID vaccination studies.

Purpose of the Study:

• To review and emphasize clinically relevant outcomes of ID vaccination studies.
• To assess the potential of ID vaccination as a practical alternative for antigen delivery, especially in beef cattle.
• To highlight the need for further investigation into ID vaccination efficacy in cattle using disease-specific metrics.

Main Methods:

• Review of existing literature on ID inoculation studies.
• Emphasis on studies reporting clinically relevant outcomes (e.g., clinical protection, body weight change).
• Inclusion of immunological data (antibody titers, cytokines, cellular responses) as supportive evidence.

Main Results:

• ID vaccination is presented as a promising alternative to conventional vaccination routes.
• ID vaccination holds particular interest for the beef cattle industry due to quality assurance considerations.
• Evidence suggests ID vaccination can elicit immune responses, but further validation is required.

Conclusions:

• ID vaccination is a viable alternative for delivering antigens across species.
• Further investigation into ID vaccination in cattle is crucial, focusing on clinical endpoints like morbidity, mortality, average daily gain, and feed efficiency.
• Defining the value of ID vaccination for domesticated farm animals requires more research on practical and clinically relevant outcomes.