"Leptospirosis is a zoonotic infectious disease, meaning it can be spread from animal to human. Leptospirosis is more common in areas with warm climates and high annual rainfall but it can occur anywhere. Currently available vaccines effectively prevent leptospirosis and protect dogs for at least 12 months. Annual vaccination is recommended for at-risk dogs.*"

*“Leptospirosis.” American Veterinary Medical Association, https://www.avma.org/resources/pet-owners/petcare/leptospirosis.