

Opti-Vac® eye-drop vaccine stabilizer gives you the advantages of drops—ensuring that every bird is immunized—while repairing the carrier to ensure maximum effectiveness.
hen eye-drop vaccines are rehydrated with distilled water or ordinary sterile diluent, they immediately lose large portions of their activity. Opti-Vac provides an environment that meets the vaccine's needs, preserving valuable titers drop after drop.
Rehydrated eye-drop vaccines must be stable for optimum potency and full immunity. Research (e.g., Toro et al., 1997) has demonstrated that a decline in eye-drop
vaccine titers can reduce effectiveness. In one study, hens receiving a low-titer vaccine produced an immune response that was as poor as the birds that had received no vaccine at all ( Figure 1). Stabilizing eye-drop vaccines with Opti-Vac is an important step in preventing titer loss and ensuring that the first dose delivered is as potent as the last.
OPTIMUM PH FOR ANTIGEN SURVIVAL
- Unstable sterile diluents pose several hazards to live vaccines, including:
- Ordinary distilled water diluents are acidic by nature. This causes a rapid loss of vaccine titer after reconstitution.
- Vaccines that are diluted with an acidic diluent die rapidly, meaning most of the flock will not get the proper dose to develop good immunity. Because Opti-Vac eye-drop stabilizer keeps vaccines at the ideal pH, titers are maintained until the very last drop.
ISOTONIC ENVIRONMENT TO PROTECT VACCINE TITER
In addition to requiring a proper pH, many live vaccine antigens also require an isotonic environment, particularly fragile bacterial vaccines, such as Mycoplasmas. A USDA study compared vaccines diluted with isotonic Opti-Vac stabilizer to a typical hypotonic diluent to demonstrate this effect (Leigh et al., 2008).
Using Opti-Vac to rehydrate the vaccine prevented a loss of titer, preserving the full strength of each dose (Figure 2). The ordinary sterile diluent caused a 50-80% loss of the vaccines' titers when compared to vaccine rehydrated with Opti-Vac. Birds receiving the vaccine mixed with ordinary diluent would receive only 20-50% of the proper dose needed to develop a solid immune response.