Leptospirosis in three workers on a dairy farm with unvaccinated cattle.

Aim: We report a one-health investigation of three cases of leptospirosis on a dairy farm with unvaccinated cattle in New Zealand. The cases are discussed in the context of diagnostics, risk factors, persistence of symptoms and outbreak mitigation measures.

Method: Clinical and laboratory records from the human cases were reviewed and serological and molecular investigations were conducted into the Leptospira status of cattle and pigs on the farm.