SpayVac is a single-dose (or no-booster-needed) fertility-control solution that uses pZP as the active ingredient known as the antigen.

Porcine Zona Pellucida--active ingredient

Zona Pellucida (ZP) is a translucent, mesh-like membrane that surrounds the egg. pZP antigen – the zona pellucida (ZP) is the binding site for sperm. Females vaccinated with pZP produce antibodies that bind to their ZP and block fertilization.Other antigens, besides pZP, can be used in SpayVac for different species.

Vaccimax® presents the active ingredient to the immune system

Vaccimax is composed of fatty particles called liposomes. Liposomes encapsulate the pZP. Vaccimax releases the active ingredients to the immune system over time, creating a superior long-lasting immune response.

What is a liposome?

A liposome is a small sphere, made out of the same material as a cell membrane. Liposomes can be filled with drugs, and used to deliver antigens for vaccines. There are many advantages of liposomes. The biggest advantage is the cell membrane and the liposome membrane consist of the same phospholipid bilayer. This biocompatibility makes the targeted cells readily available to accept the active content (pZP in the case of SpayVac).

How it works

SpayVac is injected into the female. The immune system then creates proteins in response. These proteins are called antibodies. They block sperm from their binding sites on the egg’s zona pellucida membrane. This immune response creates the long-term fertility control effect.

Proven efficacy across species

Tested and proven in clinical trials :


You can get a general overview of SpayVac by downloading this brochure.