Prevalence, risk factors and vaccination efficacy of contagious ovine ecthyma (orf) in England

J. Onyango, F. Mata, W. McCormick, S. Chapman

Research output: Contribution to journalJournal Articlepeer-review

14 Citations (Scopus)


Orf is a viral disease found in English sheep flocks which can cause economic losses. It is a zoonosis with little epidemiological research available in the UK. In 2012, 3000 questionnaires were sent to English sheep farms in order to investigate the prevalence of orf, determine vaccination efficacy and to identify some of the potential risk factors. The usable response rate was 25.4 per cent. The usable farms (N=762 in the years 2011 and 2012) were used to model the percentage of animals affected on the farm, and the probability of a farm being found with the disease. The disease prevalence (DP) was standardised for the year and calculated as 1.88 per cent for ewes and 19.53 per cent for lambs. The disease risk ratio (RR) for the use of the vaccine was calculated as 2.04 for ewes and 0.75 for lambs, and therefore, the study found that lamb vaccination was beneficial (RR
Original languageEnglish
Pages (from-to)326
Number of pages1
JournalVeterinary Record
Issue number13
Publication statusPublished - 4 Oct 2014
Externally publishedYes


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