Thursday, 30 May 2024 12:55

Vaccinate against new lepto strain

Written by  Staff Reporters
Nathan Back, DairyVets, says the new ‘Pacifica’ strain of the bacterial disease has recently become more common in NZ. Nathan Back, DairyVets, says the new ‘Pacifica’ strain of the bacterial disease has recently become more common in NZ.

A vet is calling for all animals to be vaccinated against a new strain of leptospirosis (lepto) discovered on New Zealand dairy farms in recent years.

Nathan Back, DairyVets, says the new ‘Pacifica’ strain of the bacterial disease has recently become more common in NZ. A new cattle vaccine, Lepto 4-Way, has been developed to provide an immune response against this strain and is being recommended by Back.

Back says the decision to switch leptospirosis vaccines is to better manage the risk that leptospirosis is now presenting on farms and within the local community.

“This is particularly important for people working within our practice and farms – farmers, farm workers, vets and technicians.

“To reduce this risk, we feel that all animals on farms – cows, pregnant heifers, calves and other stock – should be vaccinated with Lepto 4-Way for the coming season and this is the vaccine we will be using.”

Leptospirosis is caused by a bacteria that is spread from animal to human. Lepto is contracted most commonly through exposure to the urine of infected animals, either through direct contact or via contaminated water. The bacteria enter through cuts or grazes on the skin, or through the mucous membranes of eyes, nose and mouth.

Matt Wells, technical veterinarian at Virbac NZ, the registerer and distributor of Lepto 4-Way, says that in recent years, New Zealand has seen an increase of cases of lepto in farmers and staff working on vaccinated farms, many of which are thought to be due to the new Pacifica strain.

Wells says vaccination of the herd is one of the most robust ways to reduce the risk of leptospirosis coming into the herd as well as rodent control, hygiene and personal care when working closely with animals and on farm and other measures such as the fencing of access to waterways and strict control around effluent spreading.

All animals in the herd will need two doses of the vaccine: an initial dose, then a booster about four to six weeks later. This will include all pregnant cows, pregnant heifers (R2) and all replacement heifer calves – this will provide the necessary immune response against the new strain.

Wells says the impact lepto can have on farm is devastating, with severe flu symptoms in humans and in some cases debilitating illness requiring hospitalisation. A recent survey conducted by Massey University showed that half of those affected were still experiencing symptoms a staggering eight months after diagnosis.

There are different types of lepto, with cows often showing no clinical signs. This means that working with dairy cows can pose a significant risk for contracting lepto, so preventing exposure is vital.

“Since the 1970s we have been fortunate to have highly effective cattle vaccines, which have reduced the rate of human infections dramatically,” says Wells.

“Unfortunately, in recent years we have seen cases of lepto in farmers and staff (including teat sealing technicians) working on vaccinated farms, many of which are thought to be due to the newly discovered strain of lepto within our dairy herds.”

This new strain, known as Pacifica, wasn’t covered by the traditional dairy cattle lepto vaccines. Recent research suggests Pacifica could be present in almost three quarters of dairy herds throughout New Zealand.

“The new cattle vaccine, Lepto 4-Way, has recently been developed to provide an immune response against the emergence of Pacifica as well as the 3 strains (Hardjo, Pomona & Copenhageni) previously covered by the traditional vaccines. Sharing a similar mindset to Nathan at DairyVets, farmers and vets throughout the country have been choosing to switch or upgrade their lepto vaccine and vaccinate their cattle with Lepto 4-Way since it became available early February,” Wells says.

More like this

Feeding newborn calves

To ensure optimal growth, health, and wellbeing of calves, feeding strategies should be considered carefully.

Featured

Australia develops first local mRNA FMD vaccine

Foot and Mouth Disease outbreaks could have a detrimental impact on any country's rural sector, as seen in the United Kingdom's 2000 outbreak that saw the compulsory slaughter of over six million animals.

NZ household food waste falls again

Kiwis are wasting less of their food than they were two years ago, and this has been enough to push New Zealand’s total household food waste bill lower, the 2025 Rabobank KiwiHarvest Food Waste survey has found.

Editorial: No joking matter

OPINION: Sir Lockwood Smith has clearly and succinctly defined what academic freedom is all about, the boundaries around it and the responsibility that goes with this privilege.

National

All eyes on NZ milk supply

All eyes are on milk production in New Zealand and its impact on global dairy prices in the coming months.

Machinery & Products

Leader balers arrive in NZ

Officially launched at the National Fieldays event in June, the Leader in-line conventional PRO 1900 balers are imported and distributed…

JDLink Boost for NZ farms

Connectivity is widely recognised as one of the biggest challenges facing farmers, but it is now being overcome through the…

New generation Defender HD11

The all-new 2026 Can-Am Defender HD11 looks likely to raise the bar in the highly competitive side-by-side category.

» Latest Print Issues Online

Milking It

Full cabinet

OPINION: Legislation being drafted to bring back the controversial trade of live animal exports by sea is getting stuck in the…

» Connect with Dairy News

» eNewsletter

Subscribe to our weekly newsletter