SpayVac is a Madison, Wisconsin-based biotechnology company developing single-dose, long-lasting vaccines for animal fertility control. At the heart of its technology is a patented liposome-based delivery platform that sets SpayVac apart from conventional approaches: a single injection provides long-lasting contraceptive protection — no booster required. By offering a non-lethal, minimally invasive alternative to surgical sterilization and repeated vaccine treatments, SpayVac is redefining how agricultural producers, wildlife managers, and conservationists address the challenge of animal population control. SpayVac's lead vaccine has proven effective across a wide range of species, including feral horses, deer, seals, African elephants, and Asian elephants. The company is also developing solutions for aquaculture and companion animals.

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