Prevalence of caseous lymphadenitis and usage of caseous lymphadenitis vaccines in sheep flocks

Abstract

Only 10 to 15% of producers are currently achieving effective CLA control through the use of recommended CLA vaccination programs. In Western Australian flocks more than 25% of effectively vaccinated ewes will be sent to abattoirs in the 2 to 3 years after this study. However, large decreases in the prevalence of CLA can be achieved by about 70% of producers by either making adjustments to their vaccination programs or buying a vaccine with a CLA component. Two or three key facts on effective CLA vaccination could be made available at the point of sale of vaccines and from abattoirs that reported the prevalence of CLA to farmers.

Caseous lymphadenitis in goats from Borena Range Land South Ethiopia slaughtered at Luna Export Abattoir

“…Among flocks surveyed in Australia, the average prevalence of CLA in adult sheep was 26% (Paton et al, 2003). Forty-five percent of the farmers interviewed in a study in the United Kingdom had seen abscesses in their sheep; however, this could be an overestimation of CLA prevalence since few farmers had investigated the causes of the abscesses (Binns et al, 2002).…”

Corynebacterium pseudotuberculosis: microbiology, biochemical properties, pathogenesis and molecular studies of virulence

“…Recent epidemiological surveys have examined the prevalence of CLA in different countries [2,3,6,11,28,85]. Among flocks surveyed in Australia, the average prevalence of CLA in adult sheep was 26% [85].…”

“…It is the etiological agent of a disease that is commonly called caseous lymphadenitis (CLA) or cheesy gland [114]. This disease is found in all the world's major sheep and goat production areas, causing significant economic losses [85,114].…”

Seroprevalence of caseous lymphadenitis in Kangal Akkaraman sheep

“…The frequency of observance of the disease in Australia was reported as 26% (7). Similarly, the CLA prevalence in sheep was found as 42.4% in a study conducted in the western United States (10), and 12.6% from bacteriological analysis and 20.08% from histopathological analysis in Tabriz (Iran).…”

“…In addition, ewes with CLA may exhibit reproduction-related symptoms such as reduced fertility, abortions, stillbirths, and neonatal infections (6). In Australia, annual losses of $12-15 million were reported from CLA due to reduced yields of meat and wool (7).…”