How to control leptospirosis on farms

摘要

Leptospirosis is mainly spread by infected cattle but can also be spread by other infected carriers such as sheep and rodents. The leptospires are present in infected pasture and watercourses and are absorbed through the nose, throat and reproductivetract of cattle. The disease (leptospires) then spread to the kidneys, uterus and udder. Infected animals excrete the leptospires in their urine; posing a risk to other cattle (and milkers). They may continue to spread the disease for weeks, months or even life. Some infected animals may show no obvious signs of disease. Bought in animals such as breeding bulls and replacement heifers may appear perfectly healthy but may introduce the disease to a herd. Co-grazing with sheep and allowing access to shared watercourses are also ways for leptospirosis to enter a herd. Leptospirosis affects fertility, milk yield and calf performance and is a danger to humans.