Lumpy Skin Disease

Last updated: 22 July 2025

What is Lumpy skin disease (LSD)?

Lumpy skin disease is a highly host-specific and causes diseases only in cattle
(Bos taurus and Bos indicus) and water buffalo (Bubalus bubalis) and has been reported in some wild ruminants. LSD virus belongs to the family Poxviridae, subfamily Chordopoxviridae, and genus Capripoxvirus.  

The disease in cattle is characterised by fever, nodules on the skin, mucous membranes and internal organs, emaciation, enlarged lymph nodes, oedema of the skin, decreased fertility, and in some cases may result in death. The disease’s characteristic cutaneous nodules typically develop on the head, neck, udder, scrotum, vulva and perineum, within 48 hours of onset of the febrile reaction, and between
7 and 19 days after infection with the virus.  

These nodules are generally well circumscribed, firm, flat-topped papules and nodules, and involve the dermis and epidermis. They can extend to the subcutis layer of the skin and, occasionally, to adjacent muscle. The nodules range from 0.5cm and 5cm in diameter and tend to contain a tissue that is creamy-grey to white in colour on cut section, which may exude serum.

With time, the nodules can either regress or result in hard, cone-shaped, necrotic tissue called “sit-fasts” that separate from the surrounding skin. These sit-fasts typically slough and leave ulcers which eventually heal and scar. Superficial lymph nodes become swollen, and swelling can develop in the udder, on the chest and on the legs. In lactating cattle there is a marked reduction in milk yield. 

The morbidity rate of LSD varies between 10-20% and mortality rates are generally low (1-5%). However, beyond animals’ well-being concerns, farmers can suffer significant economic losses from LSD and associated loss of trade, from decreased milk production, weight loss, infertility as well as damaged hides in infected cattle. 

How is LSD transmitted? 

Transmission of LSD virus (LSDV) is thought to be predominantly by blood-feeding arthropods (i.e. biting flies, mosquitoes and ticks). Direct contact with an infected animal is considered to play a minor role in the transmission of the virus. It is not known if transmission can occur via fomites, for example ingestion of feed and water contaminated with infected saliva, but the occurrence of newly detected recombinant field strains suggests these routes may be at play.  

Incidence of LSD infection is higher in times when vectors are more active (i.e. warmer temperatures). The movement and trade of infected livestock is the primary way LSDV spreads over long distances. However, because LSD is a vector-borne disease (a disease spread by biting insects). LSD can also be spread over long distances by wind transporting insects carrying the virus. 

Lumpy skin disease virus is quite stable and can be present in skin lesions for up to
35 days. The virus can be shed though nasal and lacrimal secretions, milk and semen – surviving up to 11 days in milk and up to 22 days in semen. However, there is no evidence of LSDV being present in the meat from infected animals.  

Historically, LSD infection has been concentrated in southern and eastern Africa, however since 2000, it has been seen in the Middle East, the Balkans, Bangladesh, China and Europe. The disease has not yet been reported in the Western Hemisphere or in Australia and New Zealand. As recently as July 2025, Italy and France reported their first ever occurrences of the disease, marking a change in the distribution of the virus and highlighting the need for heightened global disease surveillance and coordination. 

Evidence from the recent LSD epidemic in Europe and western Asia has revealed that successful control and eradication of LSD relies on biosecurity, early detection and movement control, followed by rapid and widespread vaccination with high quality vaccines. Given the transboundary character of the disease,
cross-border collaboration is essential for its control and prevention. 

The World Organisation for Animal Health (WOAH) urges its Members who use vaccinations to control LSD to use high quality vaccines that have been made in line with WOAH standards. For vaccine quality control, WOAH can facilitate contact with WOAH Reference Laboratories in South Africa and the UK as well as a collaborating Centre in Belgium (Validation, Quality Assessment and Quality Control of Diagnostic Assays and Vaccine for Vesicular Diseases in Europe). 

For more detailed information regarding safe international trade in terrestrial animals and their products, please refer to the chapter on LSD in the latest edition of the WOAH Terrestrial Animal Health Code.

Zoonotic potential: are humans at risk?

LSD is not a zoonotic disease, so, humans are not at risk of infection from the disease. This means it poses no threat to human health, whether through direct contact with infected animals or through the consumption of animal products such as milk or meat. However, people who depend on cattle for food and for their livelihoods could face significant economic losses due to the lowered milk production, weight loss and hide scarring associated with the disease.