Ask a Dog Vet and Get Answers to Your Dog Veterinary Questions
Leptospirosis is a disease that affects many types of animals. It is a type of bacteria. It can affect humans but isn't passed on from dogs to humans. It is called Weils disease when it affects humans and is passed on through contact from infected rats or cows urine. So it is a disease that your puppy should be vaccinated against, but it cannot pass to you from your puppy. It is a rare condition in humans.
I hope this helps allay your worries
Also, your vet will be happy to discuss the vaccination timings and pricing, it is an important vaccine to get.