It first hit the Spanish trout industry, causing losses that eventually amounted to nearly 50% of production.

While it is most famous for its impact on fish, L. garvieae has made a rare jump to humans, often following the handling or consumption of raw seafood.

Over the next few decades, it "bounced" around the world—appearing in Italy, Japan, South Africa, and Taiwan.

The journey of Lactococcus garvieae is a biological detective story that begins in a British cow pasture and ends in global fish hatcheries and modern hospitals. This Gram-positive bacterium, once a quiet resident of bovine udders, has evolved into a formidable traveler. The Unseen Traveler