Leptospirosis
October 2016


What is Leptospirosis?
Leptospirosis is an infectious disease affecting cattle and less commonly sheep and goats. 

It is caused by the bacterium Leptospira, and the two predominant strains affecting Victorian cattle are Leptospira hardjobovis and Leptospira pomona. They are contagious, causing economic loss through increased abortions and calf deaths.

Leptospirosis is transmittable to humans. If someone is infected, the economic burden is increased by medical expenses and recovery time away from work.

It is also an occupational hazard for other stock handlers such as abattoir workers and veterinarians.

Leptospirosis is a notifiable disease in Victoria. Contact Agriculture Victoria if you have an infected herd.

How is it spread?
The disease can spread between animals a number of ways:
infected stock contaminate the surrounding environment by excreting the bacterium through urine, contaminating pastures, water supplies and soil
it enters the body through exposed flesh such as cuts or membranes including eyes, nose and mouth
if conditions are favourable the bacteria can live in the environment for several weeks. It prefers warm moist soil, the surface of fresh water supplies and muddy conditions.

The disease can spread from animals to humans through:
broken skin such as cuts and abrasions
handling aborted foetus and afterbirth or assisting during calving without gloves
poor hygiene practices such as not washing hands properly after contact with livestock
indirectly from infected water or soil
urine from infected stock reaching eyes, mouth or nasal passage.

What are the signs?
Common signs include:
increased abortions, which generally occurs in heavily pregnant cows
declined quality milk with a slack appearing udder and milk becoming inconsistent and yellow in colour
reddish-brown discoloured urine, usually in calves
a rough, dry coat.

Can cattle develop immunity to the disease?
Animals can develop immunity to both strains of the disease. Immunity is developed when an unvaccinated animal is exposed to the disease.

If a majority of the herd develops immunity to leptospirosis, this reduces exposure to the disease, weakening the immune response, and putting cattle at risk of re-infection if they are not vaccinated.

Cows that have been previously infected, or vaccinated, provide antibodies in colostrum, providing immunity to their calves for up to six months.

Managing Leptospirosis
Management strategies to control leptospirosis include:
implementing a vaccination program in consultation with your vet
purchasing vaccinated stock with an animal health statement to reduce the risk of introducing infection to your herd. 
avoid running calves on poorly drained areas or paddocks with run-off from neighbouring livestock.

Vaccination
Vaccination offers the best protection against the disease. Consult your vet about using vaccines such as Zoetis Animal Health’s Ultravac® 7in1 and Leptoshield®.

Points to consider with vaccination include:
handle and store vaccines according to label recommendations
ensure needles are sharp and clean and equipment is calibrated to the correct dosage
vaccine should be administered subcutaneously, under the skin
unvaccinated cattle require two doses of vaccine, four to six weeks apart
vaccinated cattle require an annual booster to sustain a high level of immunity
calves can be vaccinated from one month of age and should receive two doses of vaccine four to six weeks apart. This should be followed by an annual booster at six to nine months of age if retaining stock for breeding purposes.
new cattle should be vaccinated on arrival if previously unvaccinated or vaccination history is unknown. Administer two doses of vaccine four to six weeks apart, followed by an annual booster. 
animals that are already infected with leptospirosis at the time of vaccination may remain carriers and may continue to shed leptospires in the urine for several months, despite subsequent vaccination.

Human Health
Leptospirosis in humans is a notifiable disease in Australia. Humans infected with the disease may exhibit the following symptoms:
high fever for approximately seven to 10 days
headache and an aversion to light
vomiting
muscular and abdominal pain.

Prevent human illness by:
regularly vaccinating stock
wearing gloves when examining infected stock
thoroughly washing hands after contact with cattle.

Seek immediate medical attention if you think you may have contracted the disease. 

For more information contact Livestock Health & Biosecurity VICTORIA on 1300 020 163 or email lhbv@vff.org.au.

Further links
Agriculture Victoria 

NSW Department of Primary Industries

Zoetis Animal Health

Author:  VFF, original version published November 2012, updated October 2016. Disclaimer: The Victorian Farmers Federation (VFF), its partners, agents and contractors do not guarantee that this publication is without flaw and do not accept any liability whatsoever for any errors, defects or omissions in the information provided. This publication is intended for general information purposes only and does not constitute financial, legal, investment, production or marketing advice. The VFF excludes all liability for any loss or damage of any kind arising in relation to this publication including any reliance on the information contained herein.

 



Take home messages

Leptospirosis is an infectious disease causing economic loss through abortion and calf deaths.

An effective vaccination program offers the best protection against the disease.

Consult your vet about the treatment of leptospirosis.

Leptospirosis is transmittable to humans, posing a risk to human health when working with infected stock. 

Seek immediate medical attention if you think you may have contracted the disease.

You can download the 'Leptospirosis Fact Sheet' from the link below
Leptospirosis Fact Sheet
(Adobe PDF File)