The world’s first vaccine for insects has arrived. Georgia biotech company Dalan Animal Health has received conditional approval from the U.S. Department of Agriculture for its vaccine that protects honeybees from American foulbrood, a bacterium that can easily wipe out colonies of 60,000 bees. The vaccine is fed to queen bees; once they ingest it, it’s deposited in their ovaries, giving developing larvae immunity as they hatch. The introduction of the vaccine comes at a critical time for honeybees, which are vital to the world’s food system—helping pollinate an estimated $15 billion worth of crops in the U.S. each year—but are declining globally because of climate change, pesticides, habitat loss, and disease. Dalan plans to develop more honeybee vaccines, and some experts are hopeful about the future. “Someday,” says Keith Delaplane, a professor of entomology at the University of Georgia, “we could have a cocktail that solves a lot of bee problems—that would be the holy grail.”